Treat SIGINT correctly in GUI sessions on MS-Windows

* src/w32proc.c (sys_signal): Don't reject SIGINT, as it is
supported by MS runtime.
* src/term.c (DEV_TTY): Move from here ...
* src/conf_post.h (DEV_TTY): ... to here.  Separate definitions
for WINDOWSNT and for the rest.
* src/keyboard.c (handle_interrupt_signal): Use DEV_TTY instead of
a literal "/dev/tty".

* etc/NEWS: Mention the behavior change.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/w32proc.c b/src/w32proc.c
index 11a121f7c09..217d005a363 100644
--- a/src/w32proc.c
+++ b/src/w32proc.c
@@ -86,9 +86,9 @@ sys_signal (int sig, signal_handler handler)
   /* SIGCHLD is needed for supporting subprocesses, see sys_kill
      below.  SIGALRM and SIGPROF are used by setitimer.  All the
      others are the only ones supported by the MS runtime.  */
-  if (!(sig == SIGCHLD || sig == SIGSEGV || sig == SIGILL
+  if (!(sig == SIGINT || sig == SIGSEGV || sig == SIGILL
         || sig == SIGFPE || sig == SIGABRT || sig == SIGTERM
-        || sig == SIGALRM || sig == SIGPROF))
+        || sig == SIGCHLD || sig == SIGALRM || sig == SIGPROF))
     {
       errno = EINVAL;
       return SIG_ERR;