-Wpragma-pack MSYS2 clang32/clang64 compiler warning with Windows

[mcuee]

Reference: github action clang build log
https://github.com/libusb/libusb/actions/runs/7255523523/job/19766296521

make  all-recursive
make[1]: Entering directory '/d/a/libusb/libusb/build-msys2-clang64'
Making all in libusb
make[2]: Entering directory '/d/a/libusb/libusb/build-msys2-clang64/libusb'
  CC       core.lo
  CC       descriptor.lo
  CC       hotplug.lo
  CC       io.lo
../../libusb/core.c:2490:10: warning: 4 enumeration values not explicitly handled in switch: 'LIBUSB_OPTION_LOG_LEVEL', 'LIBUSB_OPTION_USE_USBDK', 'LIBUSB_OPTION_NO_DEVICE_DISCOVERY'... [-Wswitch-enum]
 2490 |                 switch(options[i].option) {
      |                        ^~~~~~~~~~~~~~~~~
1 warning generated.
  CC       strerror.lo
  CC       sync.lo
  RC       libusb-1.0.lo
  CC       os/events_windows.lo
  CC       os/threads_windows.lo
In file included from ../../libusb/os/events_windows.c:24:
../../libusb/os/windows_common.h:[163](https://github.com/libusb/libusb/actions/runs/7255523523/job/19766296521#step:4:164):10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  163 | #include <pshpack1.h>
      |          ^
D:/a/_temp/msys64/clang64/include/pshpack1.h:7:9: note: previous '#pragma pack' directive that modifies alignment is here
    7 | #pragma pack(push,1)
      |         ^
In file included from ../../libusb/os/events_windows.c:24:
../../libusb/os/windows_common.h:[193](https://github.com/libusb/libusb/actions/runs/7255523523/job/19766296521#step:4:194):10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  193 | #include <poppack.h>
      |          ^
note: previous '#pragma pack' directive that modifies alignment is here
2 warnings generated.
  CC       os/windows_common.lo
  CC       os/windows_usbdk.lo
  CC       os/windows_winusb.lo
In file included from ../../libusb/os/windows_common.c:30:
../../libusb/os/windows_common.h:163:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  163 | #include <pshpack1.h>
      |          ^
D:/a/_temp/msys64/clang64/include/pshpack1.h:7:9: note: previous '#pragma pack' directive that modifies alignment is here
    7 | #pragma pack(push,1)
      |         ^
In file included from ../../libusb/os/windows_common.c:30:
../../libusb/os/windows_common.h:193:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  193 | #include <poppack.h>
      |          ^
note: previous '#pragma pack' directive that modifies alignment is here
2 warnings generated.
In file included from ../../libusb/os/windows_usbdk.c:30:
In file included from ../../libusb/os/windows_usbdk.h:27:
../../libusb/os/windows_common.h:163:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  163 | #include <pshpack1.h>
      |          ^
D:/a/_temp/msys64/clang64/include/pshpack1.h:7:9: note: previous '#pragma pack' directive that modifies alignment is here
    7 | #pragma pack(push,1)
      |         ^
In file included from ../../libusb/os/windows_usbdk.c:30:
In file included from ../../libusb/os/windows_usbdk.h:27:
../../libusb/os/windows_common.h:193:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  193 | #include <poppack.h>
      |          ^
note: previous '#pragma pack' directive that modifies alignment is here
2 warnings generated.
In file included from ../../libusb/os/windows_winusb.c:34:
In file included from ../../libusb/os/windows_winusb.h:30:
../../libusb/os/windows_common.h:163:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  163 | #include <pshpack1.h>
      |          ^
D:/a/_temp/msys64/clang64/include/pshpack1.h:7:9: note: previous '#pragma pack' directive that modifies alignment is here
    7 | #pragma pack(push,1)
      |         ^
In file included from ../../libusb/os/windows_winusb.c:34:
In file included from ../../libusb/os/windows_winusb.h:30:
../../libusb/os/windows_common.h:193:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  193 | #include <poppack.h>
      |          ^
note: previous '#pragma pack' directive that modifies alignment is here
In file included from ../../libusb/os/windows_winusb.c:34:
../../libusb/os/windows_winusb.h:310:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  310 | #include <pshpack1.h>
      |          ^
D:/a/_temp/msys64/clang64/include/pshpack1.h:7:9: note: previous '#pragma pack' directive that modifies alignment is here
    7 | #pragma pack(push,1)
      |         ^
In file included from ../../libusb/os/windows_winusb.c:34:
../../libusb/os/windows_winusb.h:404:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  404 | #include <poppack.h>
      |          ^
note: previous '#pragma pack' directive that modifies alignment is here
../../libusb/os/windows_winusb.h:446:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  446 | #include <pshpack1.h>
      |          ^
D:/a/_temp/msys64/clang64/include/pshpack1.h:7:9: note: previous '#pragma pack' directive that modifies alignment is here
    7 | #pragma pack(push,1)
      |         ^
In file included from ../../libusb/os/windows_winusb.c:34:
../../libusb/os/windows_winusb.h:456:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  456 | #include <poppack.h>
      |          ^
note: previous '#pragma pack' directive that modifies alignment is here
../../libusb/os/windows_winusb.h:698:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  698 | #include <pshpack1.h>
      |          ^
D:/a/_temp/msys64/clang64/include/pshpack1.h:7:9: note: previous '#pragma pack' directive that modifies alignment is here
    7 | #pragma pack(push,1)
      |         ^
In file included from ../../libusb/os/windows_winusb.c:34:
../../libusb/os/windows_winusb.h:707:10: warning: the current #pragma pack alignment value is modified in the included file [-Wpragma-pack]
  707 | #include <poppack.h>
      |          ^
note: previous '#pragma pack' directive that modifies alignment is here
8 warnings generated.
  CCLD     libusb-1.0.la
  DLLTOOL  .libs/libusb-1.0.dll.a
make[2]: Leaving directory '/d/a/libusb/libusb/build-msys2-clang64/libusb'

[mcuee]

This issue is not a blocker for libusb-1.0.27 as it is also there in libusb-1.0.26 (not a regression).