Lowered the version of gettext

The lower version is needed while building on RHEL.
Also po/Rules-quot file is deleted and added to .gitignore.

https://fedorahosted.org/freeipa/ticket/6418

Reviewed-By: Petr Spacek <pspacek@redhat.com>

.gitignore

@@ -12,6 +12,7 @@
 /po/POTFILES
 /po/POTFILES.in
 /po/remove-potcdate.sed
+/po/Rules-quot
 /po/stamp-po
 
 # In-tree build files