Add back WINVER check to fix VC6 compilation of wxMSW.

The changes of r72953 removed the check for WINVER around the code using
COMBOBOXINFO but it's still needed with VC^, so restore it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72958 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/choice.cpp

@@ -631,6 +631,9 @@ wxSize wxChoice::DoGetSizeFromTextSize(int xlen, int ylen) const
     // and its child part. I.e. arrow, separators, etc.
     wxSize tsize(xlen, 0);
 
+    // FIXME-VC6: Only VC6 needs this guard, see WINVER definition in
+    //            include/wx/msw/wrapwin.h
+#if defined(WINVER) && WINVER >= 0x0500
     WinStruct<COMBOBOXINFO> info;
     if ( MSWGetComboBoxInfo(&info) )
     {
@@ -638,6 +641,7 @@ wxSize wxChoice::DoGetSizeFromTextSize(int xlen, int ylen) const
                     + info.rcItem.left + 3; // right and extra margins
     }
     else // Just use some rough approximation.
+#endif // WINVER >= 0x0500
     {
         tsize.x += 4*cHeight;
     }