[release-branch.go1.15] internal/poll: treat copy_file_range EOPNOTSUPP as not-handled
For #40731
Fixes #40739
Change-Id: I3e29878d597318acf5edcc38497aa2624f72be35
Reviewed-on: https://go-review.googlesource.com/c/go/+/248258
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
(cherry picked from commit
d3a411b6debccb665da3497e7fa597c9a5ff16f1)
Reviewed-on: https://go-review.googlesource.com/c/go/+/249197
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>