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

interface/wx/event.h

@@ -2247,7 +2247,7 @@ public:
     not sent when the window is restored to its original size after it had been
     maximized, only a normal wxSizeEvent is generated in this case.
 
-    Currently this event is only generated in wxMSW, wxGTK, wxOSX/Cocoa and wxOS2
+    Currently this event is only generated in wxMSW, wxGTK and wxOSX/Cocoa
     ports so portable programs should only rely on receiving @c wxEVT_SIZE and
     not necessarily this event when the window is maximized.
 
@@ -4172,7 +4172,7 @@ public:
     Notice that the event is not triggered when the application is iconized
     (minimized) or restored under wxMSW.
 
-    @onlyfor{wxmsw,wxgtk,wxos2}
+    @onlyfor{wxmsw,wxgtk}
 
     @beginEventTable{wxShowEvent}
     @event{EVT_SHOW(func)}