Security update for libpng12
This update for libpng12 fixes the following issues:
- CVE-2015-8540: read underflow in libpng (bsc#958791).
- Submitted by Petr Gajdos (pgajdos)
Fixed bugs
bnc#958791
VUL-1: CVE-2015-8540: libpng: read underflow in libpng