tool/gocross: remove GOROOT to ensure correct toolchain use

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go(1) repsects GOROOT if set, but tool/go / gocross-wrapper.sh are explicitly intending to use our toolchain. We don't need to set GOROOT, just unset it, and then go(1) handles the rest.

Updates tailscale/corp#26717

Signed-off-by: James Tucker <james@tailscale.com>

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