subversion: fix for Security Advisory CVE-2013-4505

subversion: fix for Security Advisory CVE-2013-4505

The is_this_legal function in mod_dontdothat for Apache Subversion 1.4.0
through 1.7.13 and 1.8.0 through 1.8.4 allows remote attackers to bypass
intended access restrictions and possibly cause a denial of service
(resource consumption) via a relative URL in a REPORT request.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4505

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>