update for libpng12
Description:
This libpng12 update fixes the following two security
issues.
- bnc#873123: Fixed integer overflow leading to a
heap-based buffer overflow in png_set_sPLT() and
png_set_text_2() (CVE-2013-7354).
- bnc#873124: Fixed integer overflow leading to a
heap-based buffer overflow in png_set_unknown_chunks()
(CVE-2013-7353).
Bump PKGREVISION.
