bug 442121 - Don't call into mailnews from toolkit-makefiles.sh, r=ted

toolkit/toolkit-makefiles.sh

@@ -910,10 +910,6 @@ if test -n "$MOZ_CALENDAR"; then
   "
 fi
 
-if [ "$MOZ_MAIL_NEWS" ]; then
-  . "${srcdir}/mailnews/makefiles.sh"
-fi
-
 if test -n "$MOZ_IPCD"; then
   add_makefiles "
     ipc/ipcd/Makefile