Rate limit stuckage RNG for skedar doors

Limits calculation to 15 times per second, close to that to how fast this would execute on original hardware

src/game/propobj.c

@@ -20056,7 +20056,12 @@ bool doorCalcIntendedFrac(struct doorobj *door)
 		if (door->base.flags3 & OBJFLAG3_DOOR_STICKY) {
 			s32 value = (random() % 64) + 30;
 
+#ifndef PLATFORM_N64 // emulate low fps cal rate for stackage test
+			if (((g_Vars.lvframenum % value) == 0)
+				&& ((g_Vars.lvframe60 & 3) == 0)) {
+#else
 			if ((g_Vars.lvframenum % value) == 0) {
+#endif
 				bool dothething = false;
 				struct doorobj *loopdoor;