*/*: Go ports that use modernc.org/sqlite are for aarch64, amd64 only

The module modernc.org/sqlite (and dependencies such as modernc.org/libc)
are only available on aarch64 and amd64 FreeBSD. Other platforms are
not supported on FreeBSD right now.

Consistently mark ports using these with ONLY_FOR_ARCHS.

Approved by: portmgr (build fix blanket)
MFH: 2026Q1

(cherry picked from commit b1e7e12428e07a6f36afdc91b21ae044f4c4db3c)