Use MessageBox() in a portable way

MessageBoxA() isn't supported on WinCE

src/libvlc.c

@@ -271,9 +271,9 @@ int libvlc_InternalInit( libvlc_int_t *p_libvlc, int i_argc,
     if( config_LoadCmdLine( p_libvlc, i_argc, ppsz_argv, &vlc_optind ) )
     {
 #ifdef WIN32
-        MessageBoxA (NULL, "The command line options could not be parsed.\n"
-                     "Make sure they are valid.", "VLC media player",
-                     MB_OK|MB_ICONERROR);
+        MessageBox (NULL, TEXT("The command line options could not be parsed.\n"
+                    "Make sure they are valid."), TEXT("VLC media player"),
+                    MB_OK|MB_ICONERROR);
 #endif
         module_EndBank (true);
         return VLC_EGENERIC;