Merge r390573 from trunk:

  With all of the, uhm, interesting manners in which httpd
  can be built and installed, let's ensure httpd -V gives the
  reporter a chance to identify the APR flavor used to compile
  and to run httpd when reporting bugs.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@390597 13f79535-47bb-0310-9956-ffa450edef68