app_macro: Remove deprecated module.

For most modules that interacted with app_macro, this change is limited
to no longer looking for the current context from the macrocontext when
set.  Additionally, the following modules are impacted:

app_dial - no longer supports M^ connected/redirecting macro
app_minivm - samples written using macro will no longer work.
The sample needs a re-write

app_queue - can no longer a macro on the called party's channel.
Use gosub which is currently supported

ccss - no callback macro, gosub only

app_voicemail - no macro support

channel  - remove macrocontext and priority, no connected line or
redirection macro options
options - stdexten is deprecated to gosub as the default and only
pbx - removed macrolock
pbx_dundi - no longer look for macro

snmp - removed macro context, exten, and priority

ASTERISK-30304

Change-Id: I830daab293117179b8d61bd4df0d971a1b3d07f6

utils/extconf.c

@@ -2398,7 +2398,6 @@ struct ast_context {
 	struct ast_ignorepat *ignorepats;	/*!< Patterns for which to continue playing dialtone */
 	const char *registrar;			/*!< Registrar */
 	AST_LIST_HEAD_NOLOCK(, ast_sw) alts;	/*!< Alternative switches */
-	ast_mutex_t macrolock;			/*!< A lock to implement "exclusive" macros - held whilst a call is executing in the macro */
 	char name[0];				/*!< Name of the context */
 };
 
@@ -4728,7 +4727,6 @@ static struct ast_context *__ast_context_create(struct ast_context **extcontexts
 	}
 	if ((tmp = ast_calloc(1, length))) {
 		ast_rwlock_init(&tmp->lock);
-		ast_mutex_init(&tmp->macrolock);
 		strcpy(tmp->name, name);
 		tmp->root = NULL;
 		tmp->registrar = registrar;