Remove Unixware and openserver support

cde/config/cf/Imake.cf

@@ -259,28 +259,6 @@ XCOMM $TOG: Imake.cf /main/30 1998/04/28 13:55:25 barstow $
 # define HPArchitecture
 #endif /* hpux */
 
-#ifdef sco
-# define MacroIncludeFile <sco.cf>
-# define MacroFile sco.cf
-# undef sco
-# undef USL
-# undef SYSV
-# undef i386
-/* # define i386Architecture */
-# define SCOArchitecture
-#endif /* sco */
-
-#ifdef USL
-# define MacroIncludeFile <usl.cf>
-# define MacroFile usl.cf
-# undef USL
-# undef SVR4
-# undef i386
-# define SVR4Architecture
-# define i386Architecture
-# define USLArchitecture
-#endif /* USL */
-
 #ifdef NCR
 # define MacroIncludeFile <ncr.cf>
 # define MacroFile ncr.cf