RT3548: Remove unsupported platforms

This last one for this ticket.  Removes WIN16.
So long, MS_CALLBACK and MS_FAR.  We won't miss you.

Reviewed-by: Richard Levitte <levitte@openssl.org>

apps/engine.c

@@ -60,9 +60,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#ifdef OPENSSL_NO_STDIO
-#define APPS_WIN16
-#endif
 #include "apps.h"
 #include <openssl/err.h>
 #ifndef OPENSSL_NO_ENGINE