mesa: fix build for x86

mesa wants to compile and run gen_matypes at build time, so make sure it
gets compiled for the host and not for the target.

Closes #323.

Signed-off-by: Jim Persson <spambox@nurd.se>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/x11r7/mesa3d/mesa3d-gen_matypes-fix.patch

@@ -0,0 +1,12 @@
+diff -ruN Mesa-7.2.orig/src/mesa/x86/Makefile Mesa-7.2/src/mesa/x86/Makefile
+--- Mesa-7.2.orig/src/mesa/x86/Makefile	2008-08-25 16:46:47.000000000 +0200
++++ Mesa-7.2/src/mesa/x86/Makefile	2009-05-08 08:46:34.000000000 +0200
+@@ -21,7 +21,7 @@
+ 
+ 
+ gen_matypes: gen_matypes.c
+-	$(CC) $(INCLUDE_DIRS) $(CFLAGS) gen_matypes.c -o gen_matypes
++	$(CC_FOR_BUILD) $(INCLUDE_DIRS) $(CFLAGS_FOR_BUILD) gen_matypes.c -o gen_matypes
+ 
+ # need some special rules here, unfortunately
+ matypes.h: ../main/mtypes.h ../tnl/t_context.h gen_matypes