Include app.h in senddtmf (bug #1594)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2938 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_senddtmf.c

@@ -20,6 +20,7 @@
 #include <asterisk/translate.h>
 #include <asterisk/options.h>
 #include <asterisk/utils.h>
+#include <asterisk/app.h>
 #include <string.h>
 #include <stdlib.h>
 #include <pthread.h>