[RFC] using `if WINDOWS` instead of `if sys.platform == 'win32'`?

[Alexander Belchenko]

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There are around 100 places where bzrlib code try to check
if it run on Windows by comparing `sys.platform == 'win32'`
or similar. About the half of this checks is inside core code,
and another half in tests.

I'd like to change this places by defining in bzrlib/__init__.py
constant with name 'WINDOWS' or something similar and use
this constant where needed.

WINDOWS = sys.platform == 'win32'

...


if WINDOWS:
	do_something_crazy()

if not WINDOWS:
	do_another_thing()


Proposed change should make code more clear.
Anyone have objections or suggestions?

[µ]
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