The epoll_event struct was not correct for ppc64* arches. This has
been fixed in the syscall package by CL 22207. This patch makes
the same change, in addition to adding some missing syscalls needed
by fsnotify.

See the following for more info:
https://github.com/fsnotify/fsnotify/issues/130
https://github.com/golang/go/issues/15393

Fixes #15393

Change-Id: Iedad28274ec1d3e48787c34991a725690f3b204d
Signed-off-by: Christy Perez <christy@linux.vnet.ibm.com>
Reviewed-on: https://go-review.googlesource.com/22605Reviewed-by: Ian Lance Taylor <iant@golang.org>