Disable CallAfter() for MSVC 7 too, it can't compile this code.

It was already disabled for VC6 but VC7 doesn't compile this code neither, so
disable it for this compiler as well.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73025 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/event.h

@@ -527,7 +527,8 @@ public:
 
          Note that currently only up to 2 arguments can be passed.
 
-         @note This method is not available with Visual C++ 6 which doesn't
+         @note This method is not available with Visual C++ before version 8
+               (Visual Studio 2005) as earlier versions of the compiler don't
                have the required support for C++ templates to implement it.
 
          @since 2.9.5