we only need to include stdlib.h once. Thanks bkw

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1754 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_skel.c

@@ -19,7 +19,6 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-#include <stdlib.h>
 #include <pthread.h>
 
 static char *tdesc = "Trivial skeleton Application";