Hadrian's `--configure` flag is broken on Windows

For some reason I can no longer use Hadrian's --configure flag. When I use it, the configuration step fails with the following obscure error:

rm: cannot remove '.MTREE': No such file or directory

This is certainly caused by this line in configure.ac:

It's unclear what should be done in this case.

Here is the command line I use to invoke Hadrian:

hadrian\build --configure -j --flavour=quickest --integer-simple

When I run the configure script manually from the MinGW shell, it works fine.

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