irc/komanda-cli: fix building on riscv64
Bump golang.org/x/sys dependency to a version new enough to
support risc64-freebsd. While we are at it:
- remove useless GH_TUPLE entries (upstream vendors these)
- only strip if stripping is requested
Sponsored by: Berliner Linux User Group e.V.
Approved by: portmgr (build fix blanket)
Differential Revision: https://reviews.freebsd.org/D39152