ap_document_root_check must live in libhttpd, not in the httpd binary,

due to the way that symbols are resolved.

Generally, main.c should export nothing.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@997396 13f79535-47bb-0310-9956-ffa450edef68