core: Split out the ability to parse wildcard files and directories

from the Include/IncludeOptional directives into a generic set of
functions ap_dir_nofnmatch() and ap_dir_fnmatch().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1847430 13f79535-47bb-0310-9956-ffa450edef68