Fix implicit declaration of function 'prctl' in clatd.

Change-Id: I55b46a2b65e4168f1af74a6220dbccc4b1147aa6
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>