Fix building with glib-2.32
In >=glib-2.31, most glib subheaders cannot be included directly. See
http://git.gnome.org/browse/glib/commit/?id=7455dd370eb37ce3b0b409ff6120501f37b50569
--- a/loudmouth/lm-error.c Sun Dec 04 15:32:11 2011 +0100
+++ b/loudmouth/lm-error.c Fri Apr 20 14:10:38 2012 -0400
@@ -25,7 +25,7 @@
*/
#include <config.h>
-#include <glib/gerror.h>
+#include <glib.h>
#include "lm-error.h"
GQuark