0.8.3.87

0.8.3.87
	After vast effort (mostly Christophe's) we have a fix for the
	hangs in multithreaded CLX.  Under some circumstances we could
	be trying to scavenge one thread's stack using the stack
	pointer from another: needless to say, this is not too effective.

	When sleeping on a queue, loop around sigwaitinfo restarting
	it until it stops returning EINTR