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/string.cpp

@@ -1169,12 +1169,6 @@ int wxString::CmpNoCase(const wxString& s) const
 
 #if wxUSE_UNICODE
 
-#ifdef __MWERKS__
-#ifndef __SCHAR_MAX__
-#define __SCHAR_MAX__ 127
-#endif
-#endif
-
 wxString wxString::FromAscii(const char *ascii, size_t len)
 {
     if (!ascii || len == 0)