well, (kinda) backport LimitInternalRecursion. This prevents

well, (kinda) backport LimitInternalRecursion. This prevents
the server from crashing if someone configure an infinite loop of
internal redirects and subrequests. Default value is 20/20
(subsequent redirects/nested subrequests), 0 means unlimited.

The patch works fine on my box, but is required to be tested
extensively before the next release.

PR: 19753 (and probably more)
Obtained from: 2.0 patch
Reviewed by:	original 2.0 port by Justin and BrianP (?)

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@100468 13f79535-47bb-0310-9956-ffa450edef68