Pull up following revision(s) (requested by mrg in ticket #901):
	external/mit/xorg/lib/libX11/Makefile.libx11: revision 1.11
hack for old gcc.
Pull up following revision(s) (requested by mrg in ticket #902):
	external/mit/xorg/lib/libXi/Makefile: revision 1.10
fix vax build issues - GCC 4.1 warns about always true comparisons
more than GCC 4.5 does.
Ticket 901 and 902.