os.listdir inconsistenly releases the GIL on win32

[rfk]

BPO	6915
Nosy	@loewis, @pitrou
Files	listdir_gil.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/pitrou'
closed_at = <Date 2010-08-10.00:04:32.716>
created_at = <Date 2009-09-15.04:43:13.840>
labels = ['type-bug', 'library']
title = 'os.listdir inconsistenly releases the GIL on win32'
updated_at = <Date 2010-08-10.00:04:32.714>
user = 'https://bugs.python.org/rfk'

bugs.python.org fields:

activity = <Date 2010-08-10.00:04:32.714>
actor = 'pitrou'
assignee = 'pitrou'
closed = True
closed_date = <Date 2010-08-10.00:04:32.716>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2009-09-15.04:43:13.840>
creator = 'rfk'
dependencies = []
files = ['14892']
hgrepos = []
issue_num = 6915
keywords = ['patch']
message_count = 2.0
messages = ['92643', '113500']
nosy_count = 3.0
nosy_names = ['loewis', 'pitrou', 'rfk']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue6915'
versions = ['Python 3.1', 'Python 2.7', 'Python 3.2']

[rfk]

The win32 implementation of os.listdir() releases the GIL around calls
to FindNextFile, but not around calls to FindFirstFile. Attached is a
simple patch to consistently release the GIL around any such calls.

[pitrou]

The original patch also modifies attributes_from_dir() and attributes_from_dir_w(), but these are called with the GIL released.
Modified patch committed in r83921 (py3k), r83922 (3.1) and r83923 (2.7). Thank you!