update for libpng15

This libpng update fixes the following security issue:

- bnc#873124: Fixed integer overflow leading to a heap-based buffer
overflow in png_set_unknown_chunks() (CVE-2013-7353).
- bnc#873123: integer overflow leading to a heap-based buffer
overflow in png_set_sPLT() and png_set_text_2() (CVE-2013-7354)

Fixed bugs
bnc#873124
VUL-0: CVE-2013-7353: libpng: integer overflow leading to a heap-based buffer overflow in png_set_unknown_chunks()
bnc#873123
VUL-0: CVE-2013-7354: libpng: integer overflow leading to a heap-based buffer overflow in png_set_unknown_chunks()
Selected Binaries
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