The Tcl_Exit() replacement proc takes charge of calling exit()
So this function can be easily migrated to libc atexit() which will
now run during exit() not just before. Which seems ok for the purpose
of restoring the termios state of the tty.
This solution seems compatible with TCL8 as well so all calls to this
removed API are removed.
Note this patch also removes the invalidation (of the callback so
the deefault use of Tcl_Exit() is restored) before returning from
this function. atexit() usage can not be invalidated after
registration but that can be controlled with application flag
checked inside the callback function if needed.
I have observed scenarios where I need to issue 'reset' manually
after exiting magic, still understanding better the build types
and scenarios that triggers this.
Darryl L. Miles
77a7afc8e2