Ensure that the tests expecting the results with a point as decimal separator really are done in C locale. This should help the tests pass in (French) locale used by the MSW build bot slaves. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66727 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775