Fix compiler warning because file.h isnt included

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3380 65c4cc65-6c06-0410-ace0-fbb531ad65f3

asterisk.c

@@ -32,6 +32,7 @@
 #include <asterisk/app.h>
 #include <asterisk/lock.h>
 #include <asterisk/utils.h>
+#include <asterisk/file.h>
 #include <sys/resource.h>
 #include <fcntl.h>
 #include <stdio.h>