[PATCH] Kneecap win32 locks

[Martin (gzlist)]

This patch removes most of the protection file locks provide on
windows, particularly of write locks from being read.

Before:
    Ran 20719 tests in 3007.156s

    FAILED (failures=43, errors=156, known_failure_count=13)
    2024 tests skipped

After:
    Ran 20719 tests in 3067.453s

    FAILED (failures=22, errors=29, known_failure_count=12)
    2023 tests skipped

The change is fundamentally a bad idea, but it is interesting to see
that of 199 windows failures and errors, three quarters are related to
incorrect assumptions about locks.

Also makes `bzr shelf` work, amoungst other things.

Martin
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