tests: stabilize test-persistent-nodemap.t on Windows Several issues here: - Hooks can't invoke shell scripts on Windows, so use `sh` to launch - `dd` in MSYS only recognizes `status=noxfer` - The `PATH` updating triggered a massive slowdown, but is no longer needed I have no idea why, but removing the `PATH` update substantially increased the speed of the test. It was running finishing at ~4:30 with `--debug` and ~14:50 without it, but now completes in ~2:20 on my Windows laptop. Differential Revision: https://phab.mercurial-scm.org/D10636

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  $ hg init

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  $ echo a > a

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  $ hg ci -Am t

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  adding a

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  $ hg mv a b

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  $ hg ci -Am t1

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  $ hg debugrename b

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  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3

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  $ hg mv b a

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  $ hg ci -Am t2

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  $ hg debugrename a

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  a renamed from b:37d9b5d994eab34eda9c16b195ace52c7b129980

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  $ hg debugrename --rev 1 b

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  b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3

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