as discussed with Mark a few weeks ago, the 'newstack' argument

in pbx_exec is always 1 so it can be removed.

This change also takes away ast_exec_extension(), and lets all
switch functions (exists, canmatch, exec, matchmore) all use the same
prototype, which makes the code a bit cleaner.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@16558 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/channel.h

@@ -317,10 +317,8 @@ struct ast_channel {
 	/*! Procedure causing blocking */
 	const char *blockproc;			
 
-	/*! Current application */
-	char *appl;				
-	/*! Data passed to current application */
-	char *data;				
+	const char *appl;				/*! Current application */
+	const char *data;				/*! Data passed to current application */
 	
 	/*! Which fd had an event detected on */
 	int fdno;