Some nttty.c clean-up.

include/extern.h

@@ -1620,6 +1620,7 @@ E int NDECL(tgetch);
 E int FDECL(ntposkey, (int *, int *, int *));
 E void FDECL(set_output_mode, (int));
 E void NDECL(synch_cursor);
+E void NDECL(nethack_enter_nttty);
 #endif
 
 /* ### o_init.c ### */
@@ -2779,6 +2780,11 @@ E void NDECL(dump_close_log);
 E void FDECL(dump_redirect, (BOOLEAN_P));
 E void FDECL(dump_forward_putstr, (winid, int, const char*, int));
 
+/* ### winnt.c ### */
+#ifdef WIN32
+E void NDECL(nethack_enter_winnt);
+#endif
+
 /* ### wizard.c ### */
 
 E void NDECL(amulet);

include/global.h

@@ -352,4 +352,10 @@ struct savefile_info {
 #define PANICTRACE_GDB
 #endif
 
+/* Supply nethack_enter macro if not supplied by port */
+#ifndef nethack_enter
+#define nethack_enter(argc, argv) ((void) 0)
+#endif
+
+
 #endif /* GLOBAL_H */

include/ntconf.h

@@ -256,4 +256,6 @@ extern void FDECL(ntassert_failed, (const char * exp, const char * file,
         (ntassert_failed(#expression, __FILE__, __LINE__), 0))
 #endif
 
+#define nethack_enter(argc, argv) nethack_enter_winnt()
+
 #endif /* NTCONF_H */