[Bug go/123293] go: add an option to ignore "imported and not used" and "declared but not used" errors

[bruno at clisp dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123293

--- Comment #3 from Bruno Haible <bruno at clisp dot org> ---
Another developer who has the same issue (already in 2012):
https://stackoverflow.com/questions/1718717/variable-declared-and-not-used-compilation-error/9220342#9220342