Delete the gdb-inferior pty when the gdb process exits.
* lisp/progmodes/gdb-mi.el (gdb-inferior-io--maybe-delete-pty): New function to call delete-process on the gdb-inferior buffer's pty. (gdb-reset): Use it, instead of relying on kill-buffer to kill the pty process. (gdb-update): New arg to suppress talking to the gdb process. (gdb-done-or-error): Use it. (gdb-stopped-functions): Rename from gdb-stopped-hooks. (gdb): Call gdb-inferior-io--maybe-delete-pty as a workaround for sentinel not being called. * lisp/comint.el (make-comint-in-buffer, comint-exec): Doc fix. Fixes: debbugs:11273
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