merge this fix from 2.1-dev:

  *) mod_rewrite: Perform child initialization on the rewrite log lock.
     This fixes a log corruption issue when flock-based serialization
     is used (e.g., FreeBSD).  [Jeff Trawick]

Reviewed by:	jerenkrantz, nd


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@100481 13f79535-47bb-0310-9956-ffa450edef68