some tty updates

Add a note about NO_TERMS to include/wintty.h for clarity.

Rename tty_startup and tty_shutdown to term_startup() and
term_shutdown(). They are found in termcap.c for !NO_TERMS
like most of the other term_ routines, as well as having
versions for several of the NO_TERMS platforms. They aren't
part of the tty_interface called from the core. The tty
implementation does call and rely on them.

Remove some conditional #ifdef's around term_shutdown()
(formerly tty_shutdown()) and just ensure that all the
tty platforms have an implementation that they can link
with, even if it is just a stub presently.

Put the protype for nethack_exit in extern.h to reduce
maintenance to a single spot, and remove it from other
locations. A warning in the msdos cross-compile led to
this change.

sys/share/pcmain.c

@@ -22,12 +22,6 @@
 #include <unistd.h> /* for getcwd() prototype */
 #endif
 
-#if defined(MICRO) || defined(OS2)
-ATTRNORETURN void nethack_exit(int) NORETURN;
-#else
-#define nethack_exit exit
-#endif
-
 char *exepath(char *);
 char orgdir[PATHLEN]; /* also used in pcsys.c, amidos.c */