sys: copying .gitattributes to all subrepositories
sys: copying .gitattributes to all subrepositories

Fixes #9281

Change-Id: Ia4bb2e9af9f660f42202bb1d07920578cd0f9c3e
Reviewed-on: https://go-review.googlesource.com/2076
Reviewed-by: Minux Ma <72d850dbd8858b791995463d8539b5a379577f28@golang.org>

golang/sys,npat-efault/sys,kim-racktop/sys,EricLagergren/sys-1,darkliquid/golang-sys,darkliquid/golang-sys,zhaoming200808/sys,golang/sys,stevenh/golang-sys,kim-racktop/sys,multiplay/golang-sys,EricLagergren/sys-1,darkliquid/golang-sys,kim-racktop/sys,stevenh/golang-sys,kim-racktop/sys,npat-efault/sys,zhaoming200808/sys,stevenh/golang-sys,multiplay/golang-sys,stevenh/golang-sys,EricLagergren/sys-1,npat-efault/sys,zhaoming200808/sys,golang/sys,EricLagergren/sys-1,darkliquid/golang-sys,multiplay/golang-sys,zhaoming200808/sys,multiplay/golang-sys,npat-efault/sys