Log Message:
make SIM_INLINE functions in the VAX emulator compile properly when
c99 style-inline functions are in effect (e.g. on Darwin and when
__GNUC_STDC_INLINE__ is defined).

(this was reported back when 3.8 came out on the simh mailing list,
so hopefully Bob Supnik and crew will include a fix in the next release,
when ever that is.)