Split the 286/386 interpreter away from the 486+ one (the 286/386 interpreter does not use the pccache's, readlookup's, and writelookup's as the emulated CPU's are too slow for them to be required, and also has more accurate FPU timings), also added a LPT status read function for future-proofing.

src/cpu/x87_ops_sf_compare.h

@@ -224,6 +224,7 @@ next_ins:
     return 0;
 }
 
+#ifndef OPS_286_386
 static int
 sf_FCOMI_st0_stj(uint32_t fetchdat)
 {
@@ -285,6 +286,7 @@ next_ins:
     CONCURRENCY_CYCLES((fpu_type >= FPU_487SX) ? (x87_concurrency.fcom) : (x87_concurrency.fcom * cpu_multi));
     return 0;
 }
+#endif
 
 static int
 sf_FUCOM_sti(uint32_t fetchdat)
@@ -346,6 +348,7 @@ next_ins:
     return 0;
 }
 
+#ifndef OPS_286_386
 static int
 sf_FUCOMI_st0_stj(uint32_t fetchdat)
 {
@@ -407,6 +410,7 @@ next_ins:
     return 0;
 }
 #endif
+#endif
 
 static int
 sf_FTST(uint32_t fetchdat)