tool/gocross: support running from outside the repo dir

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A bunch of us invoke tool/go from outside the repo that hosts gocross,
as a way of accessing our version-controlled toolchain. This removes
assumptions from gocross that it's being invoked within the repository
that contains its source code and toolchain configuration.

Fixes tailscale/corp#9627

Signed-off-by: David Anderson <danderson@tailscale.com>

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