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

channels/h323/ast_h323.cxx

@@ -140,7 +140,7 @@ int PAsteriskLog::Buffer::underflow()
 
 int PAsteriskLog::Buffer::sync()
 {
-	char *str = strdup(string);
+	char *str = ast_strdup(string);
 	char *s, *s1;
 	char c;
 
@@ -156,7 +156,7 @@ int PAsteriskLog::Buffer::sync()
 		ast_verbose("%s", s);
 		*s1 = c;
 	}
-	free(str);
+	ast_free(str);
 
 	string = PString();
 	char *base = string.GetPointer(2000);
@@ -2141,7 +2141,7 @@ MyH323_ExternalRTPChannel::MyH323_ExternalRTPChannel(MyH323Connection & connecti
 		/* tell the H.323 stack */
 		SetExternalAddress(H323TransportAddress(localIpAddr, localPort), H323TransportAddress(localIpAddr, localPort + 1));
 		/* clean up allocated memory */
-		free(info);
+		ast_free(info);
 	}
 
 	/* Get the payload code	*/
@@ -2388,7 +2388,7 @@ int h323_set_alias(struct oh323_alias *alias)
 			endPoint->SetGateway();
 		}
 		if (prefix)
-			free(prefix);
+			ast_free(prefix);
 	}
 	return 0;
 }