Log Message:
Update from 2.4.0 to 2.4.2. Changes:

2.4.2		2008/01/02
	Remove "-H" from the usage message.  It was meant to be a command
		line interface to "AlwaysSignHeaders" but was never
		implemented.  Problem noted by Jeff Anton.
	LIBDKIM: Make dkim_islwsp() into a macro to drastically reduce the
		number of function calls made during canonicalization.
	LIBDKIM: Fix bug #SF1857484: Fix logic problem in dkim_policy() with
		the new pstate checks.  Problem noted by Werner Wiethege;
		patch from Chris Behrens of Concentric Network Corporation.

2.4.1		2007/12/20
	Update for latest Authentication-Results: header draft.
	Avoid a NULL dereference in dkim_get_key().  Problem noted by Chris
		Behrens of Concentric Network Corporation.
	Fix bug #SF1842970: Make the overall header byte count check
		configurable, and increase the default.  Also, add
		"On-Security" (configuration file) and "security" (command
		line) options for controlling the default reaction to such
		conditions.  While we're at it, add an "On-Default" and
		"default" option for making a global action setting.
		Requested by Mark Martinec.
	LIBAR: Fix bug #SF1852618: Handle default case of no "nameserver"
		lines in /etc/resolv.conf.  Problem noted by Mike Markley
		of Bank of America.
	LIBDKIM: Fix bug #SF1824876: Add "dkim_pstate" and make dkim_policy()
		re-entrant.  Requested by Chris Behrens of Concentric
		Network Corporation.
	LIBDKIM: Fix bug #SF1843733, SF1843782: Tighten up header name
		matching in dkim_get_header() and dkim_get_sender().  Patches
		from Chris Behrens of Concentric Network Corporation.
	LIBDKIM: Fix bug #SF1843788: Fix an off-by-one length bug in
		dkim_header().  Patch from Chris Behrens of Concentric
		Network Corporation.
	LIBDKIM: Fix bug #SF1850973: Remove MAXHDRCNT; make the arrays it
		previously defined dynamic.  Reported by Mike Markley of
		Bank of America.
	LIBDKIM: Feature request #SF1841974: Numerous performance enhancements
		from Chris Behrens of Concentric Network Corporation.