Security update for giflib

This update for giflib fixes the following issues:

- Enable Position Independent Code and inherit CFLAGS from the build system (bsc#1184123).

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1184123
AUDIT-TRACKER: packaging: [batch sle 2] sle packages with non-pie binaries
Selected Binaries
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