On Perl 5.17.6 and above, hash seeding has changed, and HvREHASH has disappeared.
Patch to update mod_perl accordingly from rt.cpan.org #83921. [Zefram]

git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/trunk@1457618 13f79535-47bb-0310-9956-ffa450edef68