New Boost.Build regression/failure

From: John Maddock (jz.maddock_at_[hidden])
Date: 2021-02-03 18:24:53

This: 
https://ci.appveyor.com/project/jzmaddock/config/builds/37592647/job/l6ogy7rl9n0gvl91

Has just started failing.  Any ideas anyone?

Thanks, John.

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