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

include/asterisk/utils.h

@@ -398,7 +398,6 @@ char *ast_process_quotes_and_slashes(char *start, char find, char replace_with);
 
 long int ast_random(void);
 
-#define ast_free free
 
 /*! 
  * \brief free() wrapper
@@ -413,6 +412,7 @@ static void ast_free_ptr(void *ptr)
 	ast_free(ptr);
 }
 #else
+#define ast_free free
 #define ast_free_ptr ast_free
 #endif
 
@@ -598,19 +598,6 @@ int _ast_vasprintf(char **ret, const char *file, int lineno, const char *func, c
 }
 )
 
-#else
-
-/* If astmm is in use, let it handle these.  Otherwise, it will report that
-   all allocations are coming from this header file */
-
-#define ast_malloc(a)		malloc(a)
-#define ast_calloc(a,b)		calloc(a,b)
-#define ast_realloc(a,b)	realloc(a,b)
-#define ast_strdup(a)		strdup(a)
-#define ast_strndup(a,b)	strndup(a,b)
-#define ast_asprintf(a,b,...)	asprintf(a,b,__VA_ARGS__)
-#define ast_vasprintf(a,b,c)	vasprintf(a,b,c)
-
 #endif /* AST_DEBUG_MALLOC */
 
 #if !defined(ast_strdupa) && defined(__GNUC__)