[MERGE] convert locking problems in selftest at win32 into known errors

[Alexander Belchenko]

I'm sick to see locking errors in selftest output again and agin.
Here the patch, that adds 2 new methods: expectError (to convert known
[locking] errors to knownFailure) and get_xbit (to read executable bit
in the right way depending on underlying platform).

Without this patch I have selftest result:

Ran 8939 tests in 2702.953s
FAILED (failures=4, errors=67, known_failure_count=2)
869 tests skipped

With this patch I have:

Ran 8939 tests in 2763.421s
FAILED (failures=4, errors=10, known_failure_count=31)
869 tests skipped


Alexander.

(OS locks sucks.)
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