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use fancy .In macro for includes. from Jan Klemkow. ok jmc schwarze

Add pthread spinlock support.

Implementation, documentation and naive regression tests for:
- pthread_spin_init()
- pthread_spin_destroy()
- pthread_spin_lock()
- pthread_spin_trylock()
- pthread_sp

Add pthread spinlock support.

Implementation, documentation and naive regression tests for:
- pthread_spin_init()
- pthread_spin_destroy()
- pthread_spin_lock()
- pthread_spin_trylock()
- pthread_spin_unlock()

Implementation okay guenther@, documentation okay jmc@.

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