Merge r1520875 from trunk:

elaborate on fastcgistarer, which is a) not yet supported on windows and
b) only needed when the frameworker doesn't have something built-in.




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1520876 13f79535-47bb-0310-9956-ffa450edef68