nouveau_dri->gallium breaks MKDEBUG{,_LIB} builds

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

Following this commit:

  http://mail-index.netbsd.org/source-changes/2015/10/26/msg069660.html

building with MKDEBUG=yes MKDEBUG_LIB=yes fails.

Add to "xdebug" set list:

+Index: distrib/sets/lists/xdebug/md.i386
+===================================================================
+RCS file: /cvsroot/src/distrib/sets/lists/xdebug/md.i386,v
+retrieving revision 1.21
+diff -u -p -r1.21 md.i386
+--- distrib/sets/lists/xdebug/md.i386	13 Oct 2015 04:33:22 -0000	1.21
++++ distrib/sets/lists/xdebug/md.i386	26 Oct 2015 23:27:43 -0000
+@@ -116,6 +116,7 @@
+ ./usr/libdata/debug/usr/X11R7/lib/modules/dri/mach64_dri.so.0.debug	-unknown-		obsolete
+ ./usr/libdata/debug/usr/X11R7/lib/modules/dri/mesa_dri_drivers.so.0.debug	-unknown-	xorg,debug
+ ./usr/libdata/debug/usr/X11R7/lib/modules/dri/mga_dri.so.0.debug	-unknown-		obsolete
++./usr/libdata/debug/usr/X11R7/lib/modules/dri/nouveau_dri.so.0.debug	-unknown-		xorg,debug
+ ./usr/libdata/debug/usr/X11R7/lib/modules/dri/r128_dri.so.0.debug	-unknown-		obsolete
+ ./usr/libdata/debug/usr/X11R7/lib/modules/dri/r200_dri.so.0.debug	-unknown-		xorg,debug
+ ./usr/libdata/debug/usr/X11R7/lib/modules/dri/r300_dri.so.0.debug	-unknown-		xorg,debug

-- 
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