Move SC_* defines into <machine/setjmp.h>, and rename them,so that <machine/signal.h> is not needed in setjmp.S.Suggested by kettenis@ long ago, OK deraadt@
Normalize sentinel. Use _MACHINE_*_H_ and _<ARCH>_*_H_ properly and consitently.Discussed and okay drahn@. Okay deraadt@.
copyrigths
initial mips64