Remove Unixware and openserver support

cde/programs/dtmail/dtmailpr/dmx.hh

@@ -96,7 +96,7 @@ enum DmxHeaders
 };
 
 // This is undoubtedly illegal, unethical, and immoral.  So sue me.
-#if !defined(SunOS) && !defined(USL) && !defined(_AIX)
+#if !defined(SunOS) && !defined(_AIX)
 #undef boolean_t
 typedef enum { B_FALSE, B_TRUE } boolean_t;
 #endif // SunOS

cde/programs/dtmail/dtmailpr/message.C

@@ -51,11 +51,7 @@
 // For CHARSET
 #include <DtHelp/LocaleXlate.h>
 #include <locale.h>
-#if !defined(USL)
 #include <strings.h>
-#else 
-#include <EUSCompat.h>
-#endif 
 #include "utils/str_utils.h"