internal/poll: make sendfile(2) work on Androids
Fixes some Android builders.
Ref:
https://build.golang.org/log/
2b60164954ad0c56ce5134cb2bb81d1532723253
https://build.golang.org/log/
f5290236a27b099020fe56ff5d271886353b64f8
Change-Id: Ia5305aefa9ca8230dfa0cd892b79b8cf60e40430
Reviewed-on: https://go-review.googlesource.com/c/go/+/622998
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>