app_dial: Honor the 'c' flag when the calling party hangs up

Apparently this feature became broken in 11, probably as a result
of the Hangup Cause project.

(closes issue ASTERISK-21113)
Reprted by: Heiko Wundram
Patches:
	app_dial.patch uploaded by Heiko Wundram (license 5822)
........

Merged revisions 381880 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@381881 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -3096,7 +3096,7 @@ out:
 	}
 
 	ast_channel_early_bridge(chan, NULL);
-	hanguptree(&out_chans, NULL, ast_channel_hangupcause(chan)==AST_CAUSE_ANSWERED_ELSEWHERE ? 1 : 0 ); /* forward 'answered elsewhere' if we received it */
+	hanguptree(&out_chans, NULL, ast_channel_hangupcause(chan)==AST_CAUSE_ANSWERED_ELSEWHERE || ast_test_flag64(&opts, OPT_CANCEL_ELSEWHERE) ? 1 : 0 ); /* forward 'answered elsewhere' if we received it */
 	pbx_builtin_setvar_helper(chan, "DIALSTATUS", pa.status);
 	senddialendevent(chan, pa.status);
 	ast_debug(1, "Exiting with DIALSTATUS=%s.\n", pa.status);