Faster strip whitespace cleaning script

From: Trent Piepho <xyzzy@speakeasy.org>

Faster script that doesn't use any temporary files.  The old one
would also miss cleaning four spaces in a row in places where
it would clean one to eight spaces.  Has two options:
        fast
Only clean whitespace in files Hg thinks are modified or added.  Used by
make whitespace and much (about 100x) faster.
        manifest
Clean all files controlled by Hg, using "hg manifest"
The default with no options is the old behaviour, clean all files under
the linux directory, except CVS files.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

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