dev-go/golint: DEPEND on compatible go-tools

dev-go/golint: DEPEND on compatible go-tools

This solves the following build failure with go-tools-0_pre20180817:

src/github.com/golang/lint/lint.go:25:2: cannot find package "golang.org/x/tools/go/gcimporter15" in any of:
        /usr/lib/go/src/golang.org/x/tools/go/gcimporter15 (from $GOROOT)
        /var/tmp/portage/dev-go/golint-0_pre20161114/work/golint-0_pre20161114/src/golang.org/x/tools/go/gcimporter15 (from $GOPATH)
        /usr/lib/go-gentoo/src/golang.org/x/tools/go/gcimporter15

Package-Manager: Portage-2.3.49, Repoman-2.3.10