[clear] updated Exim CSA patch

I've updated my CSA patch for Exim to fix at least one bug found since the
last update. This patch is against version 4.51 and is included in the
current Exim CVS which will be version 4.52.

http://www.cus.cam.ac.uk/~fanf2/hermes/doc/antiforgery/exim-csa.patch

Tony.
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f.a.n.finch  <dot(_at_)dotat(_dot_)at>  http://dotat.at/
BISCAY: WEST 5 OR 6 BECOMING VARIABLE 3 OR 4. SHOWERS AT FIRST. MODERATE OR
GOOD.