[COMMITTED] sem_post.c: Include atomic.h.

[Carlos O'Donell]

While doing some x86/x86-64 work I noticed some compiler
warnings about implicit definitions of atomic functions.

The sem_post.c file uses atomic functions without including
atomic.h.

Committed per consensus about including the headers you need. 

2013-04-07  Carlos O'Donell  <carlos@redhat.com>

	* sysdeps/unix/sysv/linux/sem_post.c: Include atomic.h.

diff --git a/nptl/sysdeps/unix/sysv/linux/sem_post.c b/nptl/sysdeps/unix/sysv/linux/sem_post.c
index 6d3657c..622c7b0 100644
--- a/nptl/sysdeps/unix/sysv/linux/sem_post.c
+++ b/nptl/sysdeps/unix/sysv/linux/sem_post.c
@@ -17,6 +17,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <atomic.h>
 #include <errno.h>
 #include <sysdep.h>
 #include <lowlevellock.h>
---

Cheers,
Carlos.