Bug in latest snapshot (patch).

[Sergei Organov]

I believe I've found bug in the ss-20010424 snapshot. Please see attached
patch.

The bug shows itself when counting semaphore is released from ISR and obtained
from thread. The effect is that the thread is eventually blocked on unlocked
semaphore :-( I think there is a race condition in the semaphore
_CORE_semaphore_Seize_isr_disable code where interrupts are unlocked too early
(apparently due to nasty mistake introduced by copy-and-paste of code from
another place).

BR,
Sergei.

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