[gimp] Don't use GNU specific extension

[Mukund Sivaraman <muks src gnome org>]

commit e582cdd23de7fbbacc3f72419541505562f6bcc3
Author: Mukund Sivaraman <muks banu com>
Date:   Sat Aug 28 09:38:15 2010 +0530

    Don't use GNU specific extension

 menus/Makefile.am |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/menus/Makefile.am b/menus/Makefile.am
index cbb2f5a..68c7715 100644
--- a/menus/Makefile.am
+++ b/menus/Makefile.am
@@ -55,7 +55,9 @@ if GIMP_UNSTABLE
 DEBUG_MENU_PARAMS = --stringparam debug-menu yes
 endif
 
-%.xml: %.xml.in $(top_srcdir)/configure.ac $(srcdir)/menus.xsl dialogs-menuitems.xml
+SUFFIXES = .xml.in .xml
+
+.xml.in.xml: $(top_srcdir)/configure.ac $(srcdir)/menus.xsl dialogs-menuitems.xml
 if HAVE_XSLTPROC
 	$(XSLTPROC) --xinclude $(DEBUG_MENU_PARAMS) $(srcdir)/menus.xsl $< > $(@) || rm -f $(@)
 else