modules subdir doesn't build, but mozilla doesn't seem to need it?

removed from subdirs list to let it build again.
(r=nobody, a=nobody...sorry)

modules/Makefile

@@ -34,7 +34,6 @@ DIRS		= \
     zlib \
     li \
     progress \
-    plugin \
 	$(NULL)
 
 ifndef MOZ_SECURITY