[firefox/f15] build fix

[Martin Stransky]

commit dff2ff3eac25d67942dccf37e58e4b5e15d08455
Author: Martin Stransky <stransky at redhat.com>
Date:   Tue Jul 17 14:25:26 2012 +0200

    build fix

 firefox-mozconfig |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/firefox-mozconfig b/firefox-mozconfig
index 3a43e31..8278b5e 100644
--- a/firefox-mozconfig
+++ b/firefox-mozconfig
@@ -21,6 +21,7 @@ ac_add_options --enable-svg
 ac_add_options --enable-canvas
 ac_add_options --enable-startup-notification
 ac_add_options --enable-libxul
+ac_add_options --with-system-libxul
 ac_add_options --disable-crashreporter
 ac_add_options --enable-safe-browsing
 ac_add_options --enable-libnotify