Added macro WITH-POLLER.
Introduced function POLLER-TEST-HELPER to simplify the implementation for the tests POLLER/IPV4 and POLLER/IPV6.
Check the output of MONITORED-EVENTS in POLLER-TEST-HELPER.
Implemented missing method MONITORED-EVENTS for objects of type EPOLL-POLLER.
The call to %FF-BIND in POLL-SOCKETS will not signal an error if it is interrupted.
Added test POLL-SOCKETS/INERRUPT.

The test POLL-SOCKETS/INTERRUPT ensures that POLL-SOCKETS will do the right thing when it is interrupted.
The kevent implementation of WAIT-FOR-EVENTS no longer signals an error when the kevent system call fails with error code EINTR.
Added test POLLER/INERRUPT.

The test POLLER/INTERRUPT ensures that WAIT-FOR-EVENTS will do the right thing when it is interrupted.
The epoll implementation of the function WAIT-FOR-EVENTS will no longer signal an error when epoll_wait returns EINTR.
The tests POLLER/INTERRUPT and POLL-SOCKETS/INTERRUPT will only run if there is thread support and the platform is not Windows.