[mutter/wayland] accel-parse: Add a notice about where the code came from

[Jasper St. Pierre <jstpierre src gnome org>]

commit a7d4713393e2969cd8ea82645f67ff1aa6fec47e
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Apr 7 11:25:16 2014 -0400

    accel-parse: Add a notice about where the code came from

 src/core/meta-accel-parse.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/core/meta-accel-parse.c b/src/core/meta-accel-parse.c
index 47fc22a..e9d3054 100644
--- a/src/core/meta-accel-parse.c
+++ b/src/core/meta-accel-parse.c
@@ -30,6 +30,10 @@
 #include <string.h>
 #include <stdlib.h>
 
+/* This is copied from GTK+ and modified to work with mutter's
+ * internal structures. Originating code comes from gtk/gtkaccelgroup.c
+ */
+
 static inline gboolean
 is_alt (const gchar *string)
 {