Allow ipkg to handle conffiles if present (#3466)

SVN-Revision: 11242

tools/ipkg-utils/patches/111-buildpackage_conffiles.patch

+--- ipkg-utils-1.7-old/ipkg-buildpackage	2008-05-21 07:18:21.000000000 +0200
++++ ipkg-utils-1.7-new/ipkg-buildpackage	2008-05-21 03:22:19.000000000 +0200
+@@ -190,7 +190,7 @@
+ mkdir /tmp/${pkg}/CONTROL
+ 
+ files_required="control"
+-files_optional="preinst postinst prerm postrm"
++files_optional="preinst postinst prerm postrm conffiles"
+ 
+ for i in ${files_required} ; do
+ 	file=${CONTROL}/$i