Use wxString::t_str() in calls to Windows API functions in wxMSW.

Use t_str() instead of wx_str() to make the code work correctly in UTF-8 build
in which wx_str() returns a pointer to UTF-8 buffer while we need a wchar_t
pointer for Windows.

Closes #14371.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71640 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/main.cpp

@@ -316,7 +316,7 @@ struct wxMSWCommandLineArguments
         argv = new wxChar *[argc + 1];
         for ( int i = 0; i < argc; i++ )
         {
-            argv[i] = wxStrdup(args[i].wx_str());
+            argv[i] = wxStrdup(args[i].t_str());
         }
 
         // argv[] must be NULL-terminated