Fix spectators spawning at 0, 0 when joining mid game

src/g_game.c

@@ -2562,7 +2562,9 @@ void G_MovePlayerToSpawnOrStarpost(INT32 playernum)
 	else
 		P_MovePlayerToStarpost(playernum);
 #else
-	if (leveltime > starttime)
+	// Player's first spawn should be at the "map start".
+	// I.e. level load or join mid game.
+	if (leveltime > starttime && players[playernum].jointime > 0)
 		P_MovePlayerToStarpost(playernum);
 	else
 		P_MovePlayerToSpawn(playernum, G_FindMapStart(playernum));

src/p_mobj.c

@@ -11556,6 +11556,15 @@ void P_MovePlayerToSpawn(INT32 playernum, mapthing_t *mthing)
 	{
 		K_DoIngameRespawn(p);
 	}
+	else
+	{
+		// This is important for spectators. If you are
+		// a spectator now, then when you enter the game,
+		// respawn back at this point.
+		p->respawn.pointx = x;
+		p->respawn.pointy = y;
+		p->respawn.pointz = z;
+	}
 
 	P_AfterPlayerSpawn(playernum);
 }