Attached patch fixes compilation with httpd-2.4. I've tested it briefly, but you should test it yourself before using the patch and also inform the upstream.
Created attachment 575065 [details] proposed patch
Note that this patch fixes only compilation issue, you should still change spec files according to https://fedoraproject.org/wiki/PackagingDrafts/ApacheHTTPModules .
Thank you for the patch, applied.