configure: Filter out system includes for pixman

Other packages may provide includes for pixman as well if the host has a devel package installed. Remove them from QEMU_CFLAGS before adding our version to unsure that the right headers are used.

---
 configure | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

index 9ac2600..98c7cc8 100755
@@ -4211,8 +4211,9 @@ EOF
   fi
 fi
 
-# add pixman flags after all config tests are done
-QEMU_CFLAGS="$QEMU_CFLAGS $pixman_cflags $fdt_cflags"
+# add pixman flags after all config tests are done,
+# filtering out conflicting includes paths
+QEMU_CFLAGS=`echo "$QEMU_CFLAGS" | sed "s/-I[^ ]*pixman-1//"`" $pixman_cflags $fdt_cflags"
 libs_softmmu="$libs_softmmu $pixman_libs"
 
 echo "Install prefix    $prefix"

1.8.1.1.298.ge7eed54

Hmm, how does that happen? Shouldn't qemu use the system pixman if present? Well, maybe not in case it is too old ...

I think we should just reverse the ordering, so our pixman submodule comes first in the include path list. And it is probably a good idea to do the same for fdt.

cheers,
Gerd