Sync with the current sources from onnv-gate.

The solaris sources use a non-portable create-thread-suspended flag when
spawning the update thread; I've thrown together a pthreads portable
equivalent.  This has not had any real level of testing.

These changes include a lock around the underlying brk() call; the lack of lock
in earlier revisions of this repo may be the reason that
UMEM_OPTIONS=backend=sbrk was flaky.



git-svn-id: https://labs.omniti.com/portableumem/trunk@59 1665872d-e22b-0410-9e5d-a57ad4215e6d

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