Use diff's -w switch only on Windows, to avoid problems with inconsistent

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 8d97c1dcfa44b8925c693cf605ec3ee0cf44e75f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2009-11-23T16:02:24Z
Releases: 9.0.0
Use diff's -w switch only on Windows, to avoid problems with inconsistent
newline representations.  Per buildfarm results and subsequent discussion.
Sync up a couple of other places that had their own policies.

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