Remove wxPM, wxWidgets port to OS/2.

This port is not used and is not being worked on, so remove it to reduce the
amount of the code which needs to be updated for every global change.

Also remove tests for VisualAge compiler which isn't used since ages.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76533 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/apptrait.h

@@ -172,10 +172,8 @@ private:
 // ABX: check __WIN32__ instead of __WXMSW__ for the same MSWBase in any Win32 port
 #if defined(__WIN32__)
     #include "wx/msw/apptbase.h"
-#elif defined(__UNIX__) && !defined(__EMX__)
+#elif defined(__UNIX__)
     #include "wx/unix/apptbase.h"
-#elif defined(__OS2__)
-    #include "wx/os2/apptbase.h"
 #else // no platform-specific methods to add to wxAppTraits
     // wxAppTraits must be a class because it was forward declared as class
     class WXDLLIMPEXP_BASE wxAppTraits : public wxAppTraitsBase
@@ -267,8 +265,6 @@ public:
 // ABX: check __WIN32__ instead of __WXMSW__ for the same MSWBase in any Win32 port
 #if defined(__WIN32__)
     #include "wx/msw/apptrait.h"
-#elif defined(__OS2__)
-    #include "wx/os2/apptrait.h"
 #elif defined(__UNIX__)
     #include "wx/unix/apptrait.h"
 #elif defined(__DOS__)