Recommended update for gnuplot

This update for gnuplot fixes the following issue:

- Hardening: link as position independent executable (PIE). (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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