cmd/go: add dependencies for implicit SWIG imports
cmd/go: add dependencies for implicit SWIG imports

This fixes the misc/swig tests.

Change-Id: I60c87bbd361fe8b4f69e4507b25dc99a226da3d7
Reviewed-on: https://go-review.googlesource.com/76610
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

golang/go,josharian/go,akutz/go,Cofyc/go,golang/go,nawawi/go,cloudflare/go,codestation/go,CAFxX/go,golang/go,nawawi/go,codestation/go,golang/go,akutz/go,nawawi/go,akutz/go,codestation/go,cloudflare/go,cloudflare/go,josharian/go,nawawi/go,nawawi/go,nawawi/go,cloudflare/go,Cofyc/go,golang/go,golang/go,cloudflare/go,CAFxX/go,cloudflare/go,golang/go,CAFxX/go,codestation/go,josharian/go,codestation/go,Cofyc/go,codestation/go,josharian/go,Cofyc/go,Cofyc/go,akutz/go,Cofyc/go,akutz/go,akutz/go,christopher-henderson/Go,josharian/go,cloudflare/go,golang/go,josharian/go,CAFxX/go,Cofyc/go,nawawi/go,akutz/go,josharian/go,josharian/go,CAFxX/go,akutz/go,CAFxX/go,CAFxX/go,codestation/go,cloudflare/go,CAFxX/go,nawawi/go,Cofyc/go,codestation/go