x/build/cmd/golangbuild: wrapped command invocation is broken on Windows

[dmitshur]

The latest version of golangbuild fails to correctly wrap the "go test" invocation with "rdb.exe stream". The result is that instead of "rdb.exe", "go.exe" is being invoked instead. For example, see https://ci.chromium.org/b/8743332564145763297:

C:\b\s\w\ir\cache\tools\bin\rdb.exe stream -var goos:windows -var goarch:amd64 -var host_goos:windows -var host_goarch:amd64 -var builder:x_debug-gotip-windows-amd64 -var go_branch:master -tag bootstrap_version:1.20.6 -tag swarming_bot_id:golang-tryw-win10-us-west1-b-0-85le -- C:\b\s\w\ir\cache\tools\bin\result_adapter.exe go -v=false -dump-json C:\b\s\w\ir\x\w\go.testjson -- C:\b\s\w\ir\x\w\goroot\bin\go test -json -short ./...

go stream: unknown command
Run 'go help' for usage.

The change in CL 581695 for issue #66586 is a plausible culprit.

[gopherbot]

Change https://go.dev/cl/596815 mentions this issue: main.star: pin golangbuild to version with working command wrapping

[dmitshur]

As a mitigation to unbreak Windows builders, CL 596815 pins the previous golangbuild version.