Replace the hack to remove CVS directories with one for Subversion '.svn' directories.

There *should* be a better way to only install the manual files, and
not the '.svn' directories.

Without this, multiple make installs to the same prefix will fail.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105916 13f79535-47bb-0310-9956-ffa450edef68