Add linker flag to fix LTO for some toolchains #2050
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- address GH sipwise#2049
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When building on EL with the default flags (LTO), the build fails during the final link stage with many undefined symbol errors. Explicitly enabling the linker plugin ensures the toolchain processes LTO IR during linking.
This should not affect Debian or other toolchains that implicitly enable the plugin, where the flag is redundant and has no effect.
Tested builds:
iptchere, no legacy iptables)-latomichere)