Make sigwait() work correctly. In particular, it'll work when the

signal is already pending in the calling thread or the main thread
and there's no longer a race condition where the signal could be
diverted but sigwait() would still block.  There were some off-by-one
errors too.

(The checking of the main thread's pending list is just until a
pending list for the process can be added to struct process.  For
now, such signals end up as pending on the main thread.)

oks tedu@ and art@

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