Fix implicit declaration of function 'prctl' in clatd.

(cherry picked from commit 787ea96922dc3942946fd4ad1e0495d4e06e0c2f)

Change-Id: I4582222c8576353b800cc7d30f16c5dbe5f2e8a9
diff --git a/clatd.c b/clatd.c
index 1333e30..c2199ac 100644
--- a/clatd.c
+++ b/clatd.c
@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/ioctl.h>
+#include <sys/prctl.h>
 #include <sys/stat.h>
 #include <string.h>
 #include <errno.h>