MEDIUM: fd: add fd_poll_{recv,send} for use when explicit polling is required

MEDIUM: fd: add fd_poll_{recv,send} for use when explicit polling is required

The old EV_FD_SET() macro was confusing, as it would enable receipt but there
was no way to indicate that EAGAIN was received, hence the recently added
FD_WAIT_* flags. They're not enough as we're still facing a conflict between
EV_FD_* and FD_WAIT_*. So let's offer I/O functions what they need to explicitly
request polling.