pixman: cleanup properly on make distclean

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/Makefile b/Makefile
index 4538b87..81c660f 100644
--- a/Makefile
+++ b/Makefile
@@ -278,6 +278,7 @@
 	for d in $(TARGET_DIRS) $(QEMULIBS); do \
 	rm -rf $$d || exit 1 ; \
         done
+	test -f pixman/config.log && make -C pixman distclean
 
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