[PATCH] add bfin target

[Alain Schaefer]

Hi,

Attached is a minimal patch to add blackfin support.
It was needed to create a port of RTESM to blackfin architecture.
The patch basically just implements setjmp/longjmp.

Please review and tell me what changes would
be needed to commit it.

Thanks to joel for helping me to create this patch.

alani
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