Commit [0301f6] Maximize Restore History

1.0.42.41: use poll(2) instead of select(2) in SYSREAD-MAY-BLOCK-P

Calling select() with a single FD is just waste.

This also means that we don't use select() outside of serve-event,
paving way to having more fds open than FD_SETSIZE allows.

Nikodemus Siivola Nikodemus Siivola 2010-09-19

changed src/code/fd-stream.lisp
changed src/code/unix.lisp
changed tests/threads.impure.lisp
changed tools-for-build/grovel-headers.c
changed tools-for-build/ldso-stubs.lisp
changed NEWS
changed package-data-list.lisp-expr
changed version.lisp-expr
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