GLX_OML_swap_method
http://www.opengl.org/registry/specs/gl/OML/glx_swap_method.txt
GLX_OML_swap_method
	GLX_SWAP_METHOD_OML 0x8060
	GLX_SWAP_EXCHANGE_OML 0x8061
	GLX_SWAP_COPY_OML 0x8062
	GLX_SWAP_UNDEFINED_OML 0x8063