Remove obsolete MSVC version tests.

Don't compare __VISUALC__ with versions 1200 (VC6) and earlier, such tests are
always true or always false now that we don't support VC6 any more, so just
remove them simplifying the code.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76548 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/afterstd.h

@@ -18,24 +18,7 @@
 
 // undo what we did in wx/beforestd.h
 #if defined(__VISUALC__) && __VISUALC__ <= 1201
-    // MSVC 5 does not have this
-    #if _MSC_VER > 1100
-        #pragma warning(pop)
-    #else
-        // 'expression' : signed/unsigned mismatch
-        #pragma warning(default:4018)
-
-        // 'identifier' : unreferenced formal parameter
-        #pragma warning(default:4100)
-
-        // '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
+    #pragma warning(pop)
 #endif
 
 // see beforestd.h for explanation