go: Include temporary fix for default environment variables

[Biswa96]

Fixes #18166

[Biswa96]

This is copied from ArchLinux https://gitlab.archlinux.org/archlinux/packaging/packages/go/-/commit/97e19acbc78f2b2a19f6ed25aee510669d70fc65

[ognevny]

it fixes a bit more issues regarding GOROOT variable. or not?

[lazka]

it fixes a bit more issues regarding GOROOT variable. or not?

I don't know much about golang, but go env GOROOT returns the same thing before and after this change.

[ognevny]

it fixes a bit more issues regarding GOROOT variable. or not?

I don't know much about golang, but go env GOROOT returns the same thing before and after this change.

anyway I can set it in this file, can't I?

[Biswa96]

it fixes a bit more issues regarding GOROOT variable. or not?

This is not related to GOROOT variable. go.env sets only GOPROXY, GOSUMDB and GOTOOLCHAIN variables.

Though, we could add GOROOT in that go.env file. I am not sure about that. shell's rc file is another option.