Merge the changes from 3.0 branch.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75178 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/msvcrt.h

@@ -37,7 +37,12 @@
     #endif
 
     #include <stdlib.h>
-    #ifndef _CRTBLD
+
+    // Defining _CRTBLD should never be necessary at all, but keep it for now
+    // as there is no time to retest all the compilers before 3.0 release.
+    // Definitely do not use it with MSVS 2013 as defining it results in errors
+    // if the standard <assert.h> is included afterwards.
+    #if !defined(_CRTBLD) && !wxCHECK_VISUALC_VERSION(12)
         // Needed when building with pure MS SDK
         #define _CRTBLD
     #endif