Merge r1652955, r1652985, r1652989 from trunk:

    PR 57379: If mod_cgi and mod_cgid get installed,
    use IfModule for MPM to LoadModule mod_cgi for
    prefork and mod_cgid for all other MPMs.

    Previously when combined with --enable-load-all-modules
    both modules were loaded and it was undefined
    which one actually handled cgi requests.

    Based on a patch by olli hauer <ohauer gmx.de>.


    Addition to r1652955: Use "=" in combination
    with "test" instead of "==".


    Fix indentation and tab use after r1652955.


Submitted By: olli hauer <ohauer gmx.de> 
Reviewed By: rjung, ylavic, covener


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1673909 13f79535-47bb-0310-9956-ffa450edef68