MSVC 5 compilation fixes.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22092 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/afterstd.h

@@ -17,6 +17,20 @@
     #include "wx/msw/winundef.h"
 #endif
 #ifdef _MSC_VER
-#   pragma warning(pop)
+    // MSVC 5 does not have this
+    #if _MSC_VER > 1100
+        #pragma warning(pop)
+    #else
+        // 'expression' : signed/unsigned mismatch
+        #pragma warning(default:4018)
+
+        // 'conversion' : conversion from 'type1' to 'type2',
+        // possible loss of data
+        #pragma warning(default:4244)
+
+        // C++ language change: to explicitly specialize class template
+        // 'identifier' use the following syntax
+        #pragma warning(default:4663)
+    #endif
 #endif