Cosmetic change: use epoll_create1() instead of epoll_create()

I think that epoll_create() is confusing because it takes a 'size'
argument which is not used but must be greater than 0. In my opinion,
epoll_create1() is better because it drops the unused 'size' argument
and adds a 'flags' argument.

Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>
Bump the maximum number of events that epoll_wait() may return

Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>