This is a followup commit for 9eef40ad
and adds the constants needed for fadvise() on Linux for ARM that were
missing.

Fixes golang/go#16816

Change-Id: Ib7409f48bc07511d7014cb5791a6cc117a9a471e
Reviewed-on: https://go-review.googlesource.com/31641Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>