[mutter] window: Don't use C++-style comments

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

commit 4fc684b2ede733c138872c60a0a8abb485eb3127
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sat Mar 14 16:03:23 2015 -0700

    window: Don't use C++-style comments

 src/core/window.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index bacb9ef..ec155f8 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -71,9 +71,10 @@
 
 static int destroying_windows_disallowed = 0;
 
-// Each window has a "stamp" which is a non-recycled 64-bit ID. They
-// start after the end of the XID space so that, for stacking
-// we can keep a guint64 that represents one or the other
+/* Each window has a "stamp" which is a non-recycled 64-bit ID. They
+ * start after the end of the XID space so that, for stacking
+ * we can keep a guint64 that represents one or the other
+ */
 static guint64 next_window_stamp = G_GUINT64_CONSTANT(0x100000000);
 
 static void     invalidate_work_areas     (MetaWindow     *window);