Replace c_str() with t_str() in wxWinCE code.

This should work correctly even in UTF-8 build, should someone want to use it
under Windows CE.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74938 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/dlmsw.cpp

@@ -250,7 +250,7 @@ void *wxDynamicLibrary::RawGetSymbol(wxDllType handle, const wxString& name)
 {
     return (void *)::GetProcAddress(handle,
 #ifdef __WXWINCE__
-                                            name.c_str()
+                                            name.t_str()
 #else
                                             name.ToAscii()
 #endif // __WXWINCE__