cmd/dist: add support for freebsd/arm64
cmd/dist: add support for freebsd/arm64

Updates #24715

Change-Id: I110a10a5d5ed4a471f67f35cbcdcbea296c5dcaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/198542
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

CAFxX/go,akutz/go,CAFxX/go,golang/go,cloudflare/go,cloudflare/go,cloudflare/go,golang/go,nawawi/go,CAFxX/go,nawawi/go,nawawi/go,CAFxX/go,nawawi/go,akutz/go,golang/go,golang/go,akutz/go,cloudflare/go,nawawi/go,golang/go,akutz/go,nawawi/go,akutz/go,cloudflare/go,CAFxX/go,cloudflare/go,golang/go,nawawi/go,CAFxX/go,golang/go,CAFxX/go,akutz/go,CAFxX/go,nawawi/go,akutz/go,cloudflare/go,akutz/go,cloudflare/go,golang/go