Kill old, unused, Mach defines, and provide a correct SET_PC_REGS implementation - due to the awkwardness of the m88k architecture, PC_REGS can NOT be an lvalue.
Kill old, unused, Mach defines, and provide a correct SET_PC_REGS
implementation - due to the awkwardness of the m88k architecture, PC_REGS
can NOT be an lvalue.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars