Fix the prefix_stat function. (which does a stat call on the first

path segment). This function was still tailored for unix systems only.
It should work on other systems as well now.

Obtained from: 2.1 (r1.143)
Reviewed by: Brad Nicholes, Will Rowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@99087 13f79535-47bb-0310-9956-ffa450edef68