Add wrappers to set and get RTC wake alarm on Linux via the
RTC_WKALM_SET and RTC_WKALM_RD ioctls.
Change-Id: I98c36b2252b2fe65cfaba5dde879f6019ff1ae91
GitHub-Last-Rev: a78d0f41932c6f400784b65b1fff10eb6f1a802c
GitHub-Pull-Request: golang/sys#71
Reviewed-on: https://go-review.googlesource.com/c/sys/+/236140
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>