Define GL_GLEXT_PROTOTYPES in CFLAGS not in random places in the source
Define GL_GLEXT_PROTOTYPES in CFLAGS not in random places in the source

elmarco/spice-common,freedesktop-unofficial-mirror/spice__spice-common,fgouget/spice-common,fgouget/spice-common,freedesktop-unofficial-mirror/spice__spice-common,SPICE/spice-common,elmarco/spice-common,Fantu/spice-common,freedesktop-unofficial-mirror/spice__spice-common,fgouget/spice-common,Fantu/spice-common,SPICE/spice-common,fgouget/spice-common,elmarco/spice-common,Fantu/spice-common,freedesktop-unofficial-mirror/spice__spice-common,Fantu/spice-common,elmarco/spice-common,SPICE/spice-common