Add support for an "epoch" in the RPM spec file. This epoch is a discrete

number used to determine if one RPM is newer than another, which in turn
ensures that v1.2.10 is always interpreted as newer than v1.2.9.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@819008 13f79535-47bb-0310-9956-ffa450edef68