- Use spin lock instead of default mutex for safety. INT/IRET instructions

save/clear/restore flags but emulated flags have no effect on the host.
I believe BIOS writers never meant to run their code in emulated
environment with interrupt enabled. :-)
- Use memcpy(3) instead of copying individual members.  I believe struct
x86regs was intentionally copied from the first half of struct x86emu_regs
for this very purpose.
- Fix some style nits and consistencies.

Reviewed by:	delphij, paradox (ddkprog yahoo com)

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