Commits on Nov 7, 2020

1. Honor the rustfmt setting in config.toml …

   Prior to this, setting the rustfmt configuration was ignored:
   
   ```
   % mkdir example
   
   % cd example
   
   % ../configure --set build.rustfmt=/usr/bin/true
   
   % ../x.py fmt
   ./x.py fmt is not supported on this channel
   failed to run: /Users/shep/Projects/rust/example/build/bootstrap/debug/bootstrap fmt
   Build completed unsuccessfully in 0:00:01
   ```
   
   And after:
   
   ```
   % ../x.py fmt
   Build completed successfully in 0:00:11
   ```

   

   shepmaster committed Nov 7, 2020
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