multimedia/navidrome: mark as only for arch amd64 and arm64

Navidrome uses some arch specific nodes modules: esbuild, to build its
frontend. as such the node cache which is generated at pre-fetch is arch
dependant, make it so.

Add some hack to make sure make makesum will generate a distinfo which
contains all supported arches

Approved by: kbowling (maintainer)
Differential Revision: https://reviews.freebsd.org/D54594