Security update for libpng12

This update for libpng12 fixes the following issues:

Security issues fixed:
- CVE-2015-8540: read underflow in libpng (bsc#958791)
- CVE-2016-10087: NULL pointer dereference in png_set_text_2() (bsc#1017646)

This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#958791
VUL-1: CVE-2015-8540: libpng: read underflow in libpng
bnc#1017646
VUL-1: CVE-2016-10087: libpng,libpng12,libpng12-0,libpng15,libpng16: NULL pointer dereference in png_set_text_2()
Selected Binaries
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