net/ipinfo-cli: fix build on riscv64

• bump golang.org/x/sys dependency to version supporting riscv64-freebsd
• remove useless GH_TUPLE entries; these were already found in the main distfile.

Sponsored by: Berliner Linux User Group e.V.
Approved by: portmgr (build fix blanket)
Approved by: eduardo (mentor)
Differential Revision: https://reviews.freebsd.org/D38869