Log Message:
Add SHA512 digests for distfiles for time category

Problems found with mismatching existing digests for:
	distfiles/asclock-classic-1.0.tar.gz
	distfiles/asclock-gtk-2.1.10beta.tar.gz
	distfiles/asclock-xlib-2.0.11.tar.gz
	distfiles/emiclock-2.0.2.tar.gz

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.