Ticket #329 - Port modules to httpd 2.4
    
    The API for httpd modules changed between httpd 2.2 and 2.4.  The
    change required are simply some struct member name changes.  Changes
    to configure and the makefile were needed for detecting the version
    of httpd that we are building with.  I also found that config.h has
    to be included in mod_restartd to allow us to see the new define
    used for httpd version detection.