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/datetime.h

@@ -462,10 +462,7 @@ public:
     wxDateTime() { m_time = wxLongLong(wxINT32_MIN, 0); }
 
         // from time_t: seconds since the Epoch 00:00:00 UTC, Jan 1, 1970)
-#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
-// VA C++ confuses this with wxDateTime(double jdn) thinking it is a duplicate declaration
     inline wxDateTime(time_t timet);
-#endif
         // from broken down time/date (only for standard Unix range)
     inline wxDateTime(const struct tm& tm);
         // from broken down time/date (any range)
@@ -506,11 +503,8 @@ public:
         // set to the current time
     inline wxDateTime& SetToCurrent();
 
-#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
-// VA C++ confuses this with wxDateTime(double jdn) thinking it is a duplicate declaration
         // set to given time_t value
     inline wxDateTime& Set(time_t timet);
-#endif
 
         // set to given broken down time/date
     wxDateTime& Set(const struct tm& tm);
@@ -1636,7 +1630,6 @@ inline wxDateTime wxDateTime::Today()
     return dt;
 }
 
-#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
 inline wxDateTime& wxDateTime::Set(time_t timet)
 {
     if ( timet == (time_t)-1 )
@@ -1652,7 +1645,6 @@ inline wxDateTime& wxDateTime::Set(time_t timet)
 
     return *this;
 }
-#endif
 
 inline wxDateTime& wxDateTime::SetToCurrent()
 {
@@ -1660,12 +1652,10 @@ inline wxDateTime& wxDateTime::SetToCurrent()
     return *this;
 }
 
-#if (!(defined(__VISAGECPP__) && __IBMCPP__ >= 400))
 inline wxDateTime::wxDateTime(time_t timet)
 {
     Set(timet);
 }
-#endif
 
 inline wxDateTime::wxDateTime(const struct tm& tm)
 {