Follow-up to r24453, fix link error when building mod_dav_svn on Windows.
Follow-up to r24453, fix link error when building mod_dav_svn on Windows.

* build.conf
  (libsvn_repos): Add svn_repos_private.h to msvc-export list. 

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@864532 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion