configure: Automatically remove obsolete entries in po files.
diff --git a/configure b/configure
index a3b5ad9..013dc0b 100755
--- a/configure
+++ b/configure
@@ -15491,7 +15491,7 @@
 ALL_POT_FILES =$ALL_POT_FILES
 all: \$(ALL_PO_FILES)
 \$(ALL_PO_FILES): \$(srcdir)/po/wine.pot
-	msgmerge -U -q --backup=none \$@ \$(srcdir)/po/wine.pot && touch \$@
+	msgmerge -q \$@ \$(srcdir)/po/wine.pot | msgattrib --no-obsolete -o \$@.new && mv \$@.new \$@
 \$(srcdir)/po/wine.pot: \$(ALL_POT_FILES)
 	msgcat -o \$@ \$(ALL_POT_FILES)"
 fi