Silently recover if REDO_CHEATFDS file descriptors are closed, because they aren't completely essential and MAKEFLAGS-related warnings already get printed if all file descriptors have been closed. If MAKEFLAGS --jobserver-auth flags are closed, improve the error message so that a) it's a normal error instead of an exception and b) we link to documentation about why it happens. Also write some more detailed documentation about what's going on here.
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