Duke3d: throw S_Update() back into the main loop to prevent audio popping

source/duke3d/src/game.cpp

@@ -7127,6 +7127,8 @@ MAIN_LOOP_RESTART:
             frameJustDrawn = true;
         }
 
+        S_Update();
+
         // handle CON_SAVE and CON_SAVENN
         if (g_saveRequested)
         {