* Makefile.am, configure.ac: Add psxspin02 to exercise case where
trylock is unable to obtain the spinlock and that attempting to
unlock a spinlock from a thread which did not lock it works as
expected.
* psxspin02/.cvsignore, psxspin02/Makefile.am, psxspin02/main.c,
psxspin02/psxspin02.doc, psxspin02/psxspin02.scn, psxspin02/test.c:
New files.
