Allow the Apache-2.0 executable name to be specified with the

--with-program-name command line argument to configure.  This does not
change the name of the config files or anything else, yet.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85035 13f79535-47bb-0310-9956-ffa450edef68