cmd/go2go: add ability to specify build tags in go2go

You can specify build tags, so that imports properly work during translation,
by using the `-tags` option, e.g. `go tool go2go run -tags=appengine x.go2`.
The `-tags` option is available for all the `go2go` sub-commands.

Change-Id: Ib60e7542b10c6a561b61db23d35592b2bc7f63cd
GitHub-Last-Rev: 954cccfae819aaac1cb78b97905e2a97dfdcefa7
GitHub-Pull-Request: golang/go#45147
Reviewed-on: https://go-review.googlesource.com/c/go/+/303275
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
4 files changed
tree: 90711f0f0993b3c4be12966548bd1cfef90b2afb
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. favicon.ico
  15. LICENSE
  16. PATENTS
  17. README.go2go.md
  18. README.md
  19. robots.txt
  20. SECURITY.md
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