Backport r1439114:

rpm: Bump the epoch on mod_proxy_html so that older separately packaged
versions of mod_proxy_html don't take precedence over us.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1439117 13f79535-47bb-0310-9956-ffa450edef68