stty via /bin/sh -c + stdin redirect instead of -F /dev/tty

The -F flag isn't available on all stty implementations.  Using
shell stdin redirect (stty ... < /dev/tty) via /bin/sh is more
portable and doesn't depend on run-program preserving the
controlling terminal across subprocess boundaries.

src/components/input.lisp

@@ -45,10 +45,12 @@
 ;;; Terminal raw mode (stty on /dev/tty — portable across Unices)
 ;;; ---------------------------------------------------------------------------
 (defun stty-run (args)
-  "Run stty with ARGS on the controlling terminal. Returns stdout as string."
+  "Run stty with ARGS. Returns stdout as string."
   (with-output-to-string (s)
-    (sb-ext:run-program "stty" (append '("-F" "/dev/tty") args)
-                        :output s :input :stdin :wait t)))
+    (sb-ext:run-program "/bin/sh"
+                        (list "-c" (format nil "stty ~{~a~^ ~} < /dev/tty"
+                                           (mapcar #'princ-to-string args)))
+                        :output s :wait t)))
 
 (defun save-terminal-state ()
   "Save current terminal settings via stty -g. Returns a string."