Pull up following revision(s) (requested by mrg in ticket #559):
distrib/sets/lists/xdebug/md.amd64: revision 1.10
distrib/sets/lists/xdebug/md.i386: revision 1.11
distrib/sets/lists/xdebug/shl.mi: revision 1.18 via patch
distrib/sets/lists/xserver/md.amd64: revision 1.75
distrib/sets/lists/xserver/md.i386: revision 1.94
distrib/sets/lists/xserver/mi: revision 1.35
distrib/sets/sets.subr: revision 1.162
external/mit/xorg/lib/Makefile: revision 1.31
external/mit/xorg/lib/dri7/Makefile: revision 1.1
external/mit/xorg/lib/dri7/dri.mk: revision 1.1
external/mit/xorg/lib/dri7/libglsl7.mk: revision 1.1
external/mit/xorg/lib/dri7/libmesa/Makefile: revision 1.1
external/mit/xorg/lib/dri7/libmesa7.mk: revision 1.1
external/mit/xorg/lib/dri7/r300/Makefile: revision 1.1
share/mk/bsd.own.mk: revision 1.841
sets.subr: support machine=<xxx>, machine_arch=<xxx>, machine_cpu=<xxx> tags.
dri7: build Mesa 7 r300_dri.so for x86 platforms.

(snj)