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by complete_deferred_msg.
(post_character_message): Cancel all deferred messages when
quit_char is typed, in order to break out of potential deadlocks.
(cancel_all_deferred_msgs): New function.
(complete_deferred_msg): Don't abort if msg not found; may have
been cancelled.

(Fw32_reconstruct_hot_key): Use pre-interned symbols.

(Fw32_send_sys_command): Wait for system command to
complete before returning.