* Manually define PTRDIFF_MAX for VS C compiler
* Limit input size to SIZE_MAX/2
* Guard against overflows in indent and flow_level (CVE-2013-6393, bnc#860617)
* Prevent node index overflow (Reported by Florian Weimer).
* Fixed invalid size_t->int cast (Thank to Florian Weimer).
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/libyaml?expand=0&rev=9