OpenGL: fix loading cached shaders from GL cache files #1209
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The code that uses glProgramBinary to load compiled shaders from shaderCache/precompiled/<TitleID>_gl.bin files is unreachable. The fileSize variable is never changed so the function always fails. This means Cemu has been relying entirely on driver cache implementations for some time. (they must be pretty effective since nobody seems to have noticed this)