Blacklist building with httpd 2.2.25, 2.4.5 and 2.4.6.

* build/ac-macros/apache.m4:
  (): Check ap_release.h for 2.2.25, 2.4.5 or 2.4.6 and refuse to build.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1545835 13f79535-47bb-0310-9956-ffa450edef68