SDCC specific changes. Z80 support; re-enable __FILE__ and __LINE__ in assert -- might have broken the 8051/2


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also to adding lpc214x to arch/arm.


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arch/c5471/include and arch/dm320/include are not identical.  This is in preparation to replace arch/c5471 and arch/dm320 with arch/arm


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task_delete() calls sched_unlock(); _exit must keep pre-emption disabled until pending queue emptied.


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