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

src/unix/utilsunx.cpp

@@ -147,20 +147,10 @@
 #if !defined(HAVE_USLEEP) && \
     ((defined(__SUN__) && !defined(__SunOs_5_6) && \
                          !defined(__SunOs_5_7) && !defined(__SUNPRO_CC)) || \
-     defined(__osf__) || defined(__EMX__))
+     defined(__osf__))
     extern "C"
     {
-        #ifdef __EMX__
-            /* I copied this from the XFree86 diffs. AV. */
-            #define INCL_DOSPROCESS
-            #include <os2.h>
-            inline void usleep(unsigned long delay)
-            {
-                DosSleep(delay ? (delay/1000l) : 1l);
-            }
-        #else // Unix
-            int usleep(unsigned int usec);
-        #endif // __EMX__/Unix
+        int usleep(unsigned int usec);
     };
 
     #define HAVE_USLEEP 1
@@ -659,7 +649,7 @@ long wxExecute(char **argv, int flags, wxProcess *process,
         //     always opened so don't do it any more, after all there doesn't
         //     seem to be any real problem with keeping them opened
 
-#if !defined(__VMS) && !defined(__EMX__)
+#if !defined(__VMS)
         if ( flags & wxEXEC_MAKE_GROUP_LEADER )
         {
             // Set process group to child process' pid.  Then killing -pid