Remove support for MetroWerks CodeWarrior compiler.

This compiler doesn't exist any more and was probably unsupported even in 2.8,
let alone 2.9, so remove all the __MWERKS__ tests to simplify things.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71102 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/utilscmn.cpp

@@ -86,7 +86,7 @@
     #include "wx/osx/private.h"
 #endif
 
-#if !defined(__MWERKS__) && !defined(__WXWINCE__)
+#if !defined(__WXWINCE__)
     #include <sys/types.h>
     #include <sys/stat.h>
 #endif