internal/testenv: prefer to find go binary in GOROOT
Partial revert of https://golang.org/cl/20967 which I can't reproduce and actually breaks me more. Fixes #14901 Change-Id: I8cce443fbd95f5f6f2a5b6a4b9f2faab36167a12 Reviewed-on: https://go-review.googlesource.com/21292 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: David Crawshaw <crawshaw@golang.org>
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