Update ticket 308.
Cleanup.
Pull up following revision(s) (requested by mrg in ticket #340):
	external/mit/xorg/tools/glsl/Makefile.glslsrcs: file removal
	external/mit/xorg/lib/libGL/Makefile: revision 1.20
	external/mit/xorg/lib/libGL/Makefile.glslsrcs: revision 1.1
	external/mit/xorg/lib/libOSMesa/libmesa.mk: revision 1.9
	external/mit/xorg/lib/dri/libmesa/Makefile: revision 1.14
	external/mit/xorg/tools/glsl/Makefile: file removal
	external/mit/xorg/tools/glsl/Makefile.glsl: file removal
delete tools/glsl, is hasn't been used for a while.
move Makefile.glsl into libGL.
Pull up following revision(s) (requested by mrg in ticket #342):
	share/mk/bsd.own.mk: revision 1.838
add X11SRCDIR entries for the new separated mesa components.
339-342