- Changed random seed initialization so that it uses the system's

cryptographically secure random number generator, if available, instead
  of the current time.
- Changed the random number generator from Lee Killough's algorithm to the
  SFMT607 variant of the Mersenne Twister.

SVN r1507 (trunk)

src/g_level.cpp

@@ -480,7 +480,7 @@ void G_InitNew (const char *mapname, bool bTitleLevel)
 	{
 		if (!netgame)
 		{ // [RH] Change the random seed for each new single player game
-			rngseed = rngseed*3/2;
+			rngseed = rngseed + 1;
 		}
 		FRandom::StaticClearRandom ();
 		P_ClearACSVars(true);