In GL/gl.h, remove PFNGLBLENDCOLORPROC, PFNGLBLENDEQUATIONPROC, and the
GL_OES_EGL_image section.
PFNGLBLENDCOLORPROC and PFNGLBLENDEQUATIONPROC are defined in GL/glext.h in the
GL_VERSION_1_4 section.
GL_OES_EGL_image is defined in GLES/glext.h and GLES2/gl2ext.h, and the
GLeglImageOES typedef is also defined in GL/glext.h under
GL_EXT_EGL_image_storage.
This typedef is already defined in GL/glext.h and GLES/gl.h; including
this redundant typedef may lead to build errors.
Signed-off-by: Brian Nguyen <brnguyen@nvidia.com>