Fix l10n build of Firefox
- don't build sync
- don't build pt_PT as the currently tagged rev is broken
Prepare a bit for FF standalone build
pref("config.lockdown.printsetup", false);
pref("config.lockdown.savepage", false);
pref("config.lockdown.hidebookmark", false);
pref("config.lockdown.bookmark", false);
pref("config.lockdown.history", false);
pref("config.lockdown.history.set", false);
pref("config.lockdown.urlbar", false);
pref("config.lockdown.searchbar", false);
pref("config.lockdown.toolbarediting", false);