Log Message:
Add SHA512 digests for distfiles for chat category

Problems found with existing distfiles:
	distfiles/icb-5.0.9.tar.gz
	distfiles/icb.2.1.4.tar.Z
	distfiles/zenicb-19981202.tar.gz
No changes made to these /distinfo files.

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.