Initial softfloat port from Bochs to 86box, currently selectable only on QT.

src/cpu/x86_ops_fpu.h

@@ -96,6 +96,15 @@ opWAIT(uint32_t fetchdat)
         x86_int(7);
         return 1;
     }
+
+    if (!cpu_use_dynarec && fpu_softfloat) {
+        if (fpu_state.swd & FPU_SW_Summary) {
+            if (cr0 & 0x20) {
+                x86_int(16);
+                return 1;
+            }
+        }
+    }
     CLOCK_CYCLES(4);
     return 0;
 }