Correctly handle abandoned mutexes on non-Windows platforms

Correctly handle abandoned mutexes on non-Windows platforms

When a thread owning a mutex doesn't release it before it exits and a second
thread tries to take it using e.g. Mutex.WaitOne() an AbandonedMutexException
should be thrown. This is what .NET and Mono on Windows does.

This commit builds on the work done in PR #2267, which modifies the Win32
emulation of WaitForSingleObjectEx(), SignalObjectAndWait() and
WaitForMultipleObjectsEx() to return WAIT_ABANDONED_0 when expected, and
updates it to the current HEAD. It also adds a few test methods to
WaitHandleTest that test that WaitHandle.WaitAny() and WaitHandle.WaitAll()
follows the .NET behaviour.