Add workaround for broken GL_EXT_unpack_subimage tokens
Earlier versions of gl2ext.h defined the GL_EXT_unpack_subimage tokens without the _EXT suffix. That's been fixed and we're using the _EXT tokens now, but just in case we're using an older, broken header, define the _EXT tokens manually.
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@ -62,4 +62,15 @@ typedef EGLBoolean (EGLAPIENTRYP PFNEGLQUERYWAYLANDBUFFERWL) (EGLDisplay dpy, st
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#define EGL_BUFFER_AGE_EXT 0x313D
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#endif
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/* Mesas gl2ext.h and probably Khronos upstream defined
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* GL_EXT_unpack_subimage with non _EXT suffixed GL_UNPACK_* tokens.
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* In case we're using that mess, manually define the _EXT versions
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* of the tokens here.*/
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#if defined(GL_EXT_unpack_subimage) && !defined(GL_UNPACK_ROW_LENGTH_EXT)
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#define GL_UNPACK_ROW_LENGTH_EXT 0x0CF2
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#define GL_UNPACK_SKIP_ROWS_EXT 0x0CF3
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#define GL_UNPACK_SKIP_PIXELS_EXT 0x0CF4
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#endif
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#endif
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