Security update for giflib

giflib was updated to fix one security issue.

This security issue was fixed:
- CVE-2016-3977: Heap buffer overflow in gif2rgb (bsc#974847).

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

Fixed bugs
bnc#974847
VUL-0: CVE-2016-3977: giflib: heap buffer overflow in gif2rgb
Selected Binaries
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