merge this fix from Apache 2.1:

  *) Reorder the definitions for mod_ldap and mod_auth_ldap within
     config.m4 to make sure the parent mod_ldap is defined first.
     This ensures that mod_ldap comes before mod_auth_ldap in the
     httpd.conf file, which is necessary for mod_auth_ldap to load.
     PR 14256  [Graham Leggett]


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@97894 13f79535-47bb-0310-9956-ffa450edef68