unix: match seek argument size to signature on linux/arm
unix: match seek argument size to signature on linux/arm

Follow CL 2810

Change-Id: Ic833681c7abd8973e952aaad40986fd3385c94db
Reviewed-on: https://go-review.googlesource.com/86895
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

multiplay/golang-sys,golang/sys,golang/sys,golang/sys,multiplay/golang-sys,multiplay/golang-sys,multiplay/golang-sys