'tinygo targets' missing "nintendoswitch" entry

[gen2thomas]

found while try to update the tinygo site with doc-gen - the "Makefile" calls

go run . `tinygo targets`

used the latest release

maybe related to #2530

[deadprogram]

I think the reason it does not appear in the list is due to this:
https://github.com/tinygo-org/tinygo/blob/release/compileopts/target.go#L230