Log Message:
Update to 2.4.3. Changes since 2.4.2:

	Request addition of an "i=" tag in the signature when signing for
		subdomains.  Patch from Alin Nastac.
	TOOLS: Fix bug #SF1867259: "echo -n" is not portable.  Problem
		noted by Gary Mills.
	TOOLS: Fix bug #SF1867869: Output of the "t=" value was incorrect
		with respect to the "s" flag.  Reported by Geoff Adams.
	LIBAR: Further handling of the absence of "nameserver" lines in
		resolv.conf, this time in the manual processing code.
	LIBDKIM: Fix bug #SF1867839: 64-bit portability in rfc2822.c.
		Patch from Geoff Adams.
	LIBDKIM: Tighten up correctness of the first SSP test ("valid
		originator signature") in dkim_policy().  Problem noted
		by Alin Nastac.
	BUILD: Fix bug #SF1818906: Update site.config.m4 to include a flag
		for installing libdkim when compiling static libraries,
		and installing dkim.h in either case.  Requested by
		Chris Behrens of Concentric Network Corporation.