[MERGE] Bugfix #55276: on win32 cat, bundle and diff commands provide binary output without mangling line-endings

[Alexander Belchenko]

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Attached patch provide blackbox tests that illustrate problem
and fix for cat, bundle and diff command.

Fix made by providing new attribute of Command object: binary_stdout.
When this attribute is True self.outf object forced to be binary
stream instead of text one (by default). Because some tests
use StringIO file-like object instead of real sys.stdout
so I need to explicitly check for presence of fileno attribute.

The bug #55276 reports only about *real* problem with cat command,
but I think bundle and diff also require binary output.
(Right now bundle provide workaround by using '--output' flag;
diff generated on win32 could be applied with 'patch --binary').

Alexander

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