Fix malloc debug macros to work properly with h323.

The main problem here was that cstdlib was undefining free thereby causing the
proper debug macros to not be used. ast_h323.cxx has been changed to call
ast_free instead to avoid the issue. 

A few other issues were addressed:
- There were a few instances of functions improperly passing ast_free instead
of ast_free_ptr.
- Some clean up was done to avoid the debug macros intentionally being redefined.
(copied below from Kevin's commit, appreciate the help)
- disable astmm.h from doing anything when STANDALONE is defined, which is used
by the tools in the utils/ directory that use parts of Asterisk header files in
hackish ways; also ensure that utils/extconf.c and utils/conf2ael.c are
compiled with STANDALONE defined.

(closes issue #13593)
Reported by: pj



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@181135 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/features.c

@@ -3544,7 +3544,7 @@ static struct ast_parkinglot *build_parkinglot(char *name, struct ast_variable *
 	/* Add a parking extension into the context */
 	if (!oldparkinglot) {
 		if (!ast_strlen_zero(ast_parking_ext())) {
-			if (ast_add_extension2(con, 1, ast_parking_ext(), 1, NULL, NULL, parkcall, strdup(""), ast_free, registrar) == -1)
+			if (ast_add_extension2(con, 1, ast_parking_ext(), 1, NULL, NULL, parkcall, strdup(""), ast_free_ptr, registrar) == -1)
 				error = 1;
 		}
 	}