update for plib
This update of plib fixed two stack-based buffer overflows.
- Submitted by Wolfgang Rosenauer (wrosenauer)
Fixed bugs
bnc#738207
VUL-0: plib: ulSetError() buffer overflow
bnc#787305
VUL-1: CVE-2012-4552: plib: stack-based buffer overflow ssg/ssgParser.cxx