unix: use Getpgid to emulate Getpgrp on linux
Some Linux architectures (e.g. arm64) don't have the getpgrp syscall, use getpgid(0) to emulate it. Update golang/go#10150. This brings CL 8022 that has been applied to the syscall package to x/sys. Change-Id: I24c6d7e8b5b2f075ca4e68b142b2e03ab8a43342 Signed-off-by: Shenghou Ma <minux@golang.org> Reviewed-on: https://go-review.googlesource.com/8023Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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