* gnu/packages/networking.scm (thc-ipv6): Update to 3.8.
[source]: Use version tag instead of commit.
[arguments]: Use Gexps.
<make-flags>: Use cc-for-target as it's commented out in Makefile.
<phases>: Combine the phases 'use-source-date-epoch-in-manpages' and
'patch-paths' into a new 'patch-makefile' phase. Simplify 'install-more-docs'
phase.
[inputs]: Add libnetfilter-queue and libnfnetlink.
Signed-off-by: Leo Famulari <leo@famulari.name>
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