(svn r9251) -Fix(r6057, FS#644): Use a less CPU-intensive algorithm to find a random industry for the AI to prevent it slowing down the game. The AI now sucks a even a bit more than before (if that's even possible).

src/ai/default/default.cpp

@@ -460,7 +460,10 @@ static Town *AiFindRandomTown()
 
 static Industry *AiFindRandomIndustry()
 {
-	return GetRandomIndustry();
+	int num = RandomRange(GetMaxIndustryIndex());
+	if (IsValidIndustry(GetIndustry(num))) return GetIndustry(num);
+
+	return NULL;
 }
 
 static void AiFindSubsidyIndustryRoute(FoundRoute *fr)