add note about mk_safe checksum not being backwards compatible
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@10223 ec53bebd-3082-4978-b11e-865c3cabbd6b
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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@10223 ec53bebd-3082-4978-b11e-865c3cabbd6b