[GFS2] Remove semaphore.h from C files

We no longer use semaphores, everything has been converted to
mutex or rwsem, so we don't need to include this header any more.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/sys.c

@@ -15,7 +15,6 @@
 #include <linux/module.h>
 #include <linux/kobject.h>
 #include <linux/gfs2_ondisk.h>
-#include <asm/semaphore.h>
 #include <asm/uaccess.h>
 
 #include "gfs2.h"