Fix the CMake generation to work with older versions of CMake 2.4.x, cleaning up some of the macros and also correcting the code to detect what version of CMake is in use.

git-svn-id: http://anope.svn.sourceforge.net/svnroot/anope/trunk@2155 5417fbe8-f217-4b02-8779-1006273d7864

src/win32_memory.cpp

@@ -11,6 +11,8 @@
  * ---------------------------------------------------
  */
 
+#ifdef _WIN32
+
 #include <windows.h>
 #include <exception>
 #include <new>
@@ -55,3 +57,5 @@ void operator delete[](void *ptr)
 {
 	HeapFree(GetProcessHeap(), 0, ptr);
 }
+
+#endif