[11283] Drop the no longer used Visual Leak Detector (VLD)

For leak detection you can also use tools like Valgrind.

If you really want to use VLD you can revert this commit and remove the comments in MemoryLeaks.cpp and MemoryLeaks.h.
The VLD version which has been shipped with MaNGOS is *heavily* outdated and I thus suggest you to use a newer version of it, if you really plan to use it. You can find the newest version on github in its official repository: https://github.com/dmoulding/vld

src/shared/Common.h

@@ -62,9 +62,6 @@
 #endif                                                      // __SHOW_STUPID_WARNINGS__
 #endif                                                      // __GNUC__
 
-// must be the first thing to include for it to work
-#include "MemoryLeaks.h"
-
 #include "Utilities/UnorderedMapSet.h"
 #include <stdio.h>
 #include <stdlib.h>
@@ -109,11 +106,7 @@ typedef off_t ACE_OFF_T;
 #    define FD_SETSIZE 4096
 #  endif
 #  include <ace/config-all.h>
-// XP winver - needed to compile with standard leak check in MemoryLeaks.h
-// uncomment later if needed
-//#define _WIN32_WINNT 0x0501
 #  include <ws2tcpip.h>
-//#undef WIN32_WINNT
 #else
 #  include <sys/types.h>
 #  include <sys/ioctl.h>