Remove Unixware and openserver support

cde/programs/dtinfo/DtMmdb/dti_excs/Exception.hh

@@ -82,10 +82,8 @@ public:
   // Need to provide a plain operator new definition because we
   // have a definition of the other one below.  (See the ARM.) 
 
-#ifndef USL    
   static void *operator new (size_t size)
     { return (::operator new (size)); }
-#endif
 
   static void operator delete (void *place);
 

cde/programs/dtinfo/DtMmdb/dti_excs/Exceptions.hh

@@ -130,7 +130,7 @@ extern "C" {
 
 // This works if OBJ is an object or a pointer since Exception objects
 // overload operator ->.
-#if !defined(hpux) && !defined(USL)
+#if !defined(hpux)
 #define mthrow(OBJ) \
   (OBJ)->throw_it (__LINE__, __FILE__, DEBUG_THROW_FLAG)
 #else