bug 495604 - Make ifndef MOZ_SUITE in dlmgr Makefile.in actually work, r=sdwilsh

toolkit/components/downloads/src/Makefile.in

@@ -82,6 +82,9 @@ REQUIRES += xulapp
 endif
 endif
 
+# definition of MOZ_SUITE is only added via config.mk
+include $(topsrcdir)/config/config.mk
+
 ifndef MOZ_SUITE
 # XXX - Until Suite builds off XULRunner we can't guarantee our implementation
 # of nsIDownloadManagerUI overrides toolkit's.