bug#42059: 26.3; OpenBSD now has posix_openpt(3)

[YASUOKA Masahiko <yasuoka@yasuoka.net>]

On Fri, 26 Jun 2020 18:52:55 +0900 (JST)
YASUOKA Masahiko <yasuoka@yasuoka.net> wrote:
> OpenBSD now has posix_openpt(3), emacs should use that.
> A diff is attached.
> 
> Currently emacs uses an old way which actually causes a problem.  I am
> using gnupg through Mew(*1) which run on emacs, Mew seems to create a
> process without a pty regardless it specifies "process-connection-type
> pty" properly.  The pty is required to pass the passphrase.
> 
> *1) http://mew.org/

The patch I sent previously was reversed.  Let me update it.

--- configure.ac.orig	Thu Aug 22 07:25:23 2019
+++ configure.ac	Fri Jun 26 18:33:33 2020
@@ -4620,11 +4620,11 @@ case $opsys in
     AC_DEFINE(PTY_TTY_NAME_SPRINTF, [])
     ;;
 
-  gnu | openbsd | qnxnto )
+  gnu | qnxnto )
     AC_DEFINE(FIRST_PTY_LETTER, ['p'])
     ;;
 
-  gnu-linux | gnu-kfreebsd | dragonfly | freebsd | netbsd | darwin | nacl )
+  gnu-linux | gnu-kfreebsd | dragonfly | freebsd | openbsd | netbsd | darwin | nacl )
     dnl if HAVE_GRANTPT
     if test "x$ac_cv_func_grantpt" = xyes; then
       AC_DEFINE(UNIX98_PTYS, 1, [Define if the system has Unix98 PTYs.])