Bug 381157, Make SeaMonkey download manager use toolkit backend

supplemental patch to Bug 440932, toolkit dlmgr should be buildable by suite
r+sr=NeilAway

xpfe/components/build/Makefile.in

@@ -79,8 +79,11 @@ endif
 
 # Suite specific includes
 ifdef MOZ_SUITE
+ifdef SUITE_USING_XPFE_DM
+REQUIRES += downloadmanager
+endif
+
 REQUIRES	+= \
-		downloadmanager \
 		intl \
 		mork \
 		widget \