libyaml: add fix for CVE-2014-2525 Security Advisory

libyaml: add fix for CVE-2014-2525 Security Advisory

Heap-based buffer overflow in the yaml_parser_scan_uri_escapes function
in LibYAML before 0.1.6 allows context-dependent attackers to execute
arbitrary code via a long sequence of percent-encoded characters in a
URI in a YAML file.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2525

(From meta-openembedded rev: f58ee5acdd436f822c42bed063a319f926854f7d)

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>