disable tests which fail in build bot builds on test drive machines, as nobody is going to fix them anyhow it's better to at least be able to notice any new breakage

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@53908 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/strings/vsnprintf.cpp

@@ -19,6 +19,8 @@
     #pragma hdrstop
 #endif
 
+#if wxUSE_WXVSNPRINTF
+
 #ifndef WX_PRECOMP
     #include "wx/wx.h"
     #include "wx/wxchar.h"
@@ -465,3 +467,5 @@ void VsnprintfTestCase::Miscellaneous()
     DoMisc(5, wxT("%%%%%"), 6,  wxT("%%%%%%%%%%"));
     DoMisc(6, wxT("%%%%12"), 7,  wxT("%%%%%%%%%d"), 12);
 }
+
+#endif // wxUSE_WXVSNPRINTF