make flight a configuration option

include/globals.h

@@ -41,6 +41,8 @@
 #define SCALE_MOVEMENT_UPDATES_TO_PLAYER_COUNT
 // If defined, calculates fluid flow when blocks are updated near fluids
 #define DO_FLUID_FLOW
+// If defined, enables flight for all players
+#define ENABLE_PLAYER_FLIGHT
 
 // If defined, logs unrecognized packet IDs
 // #define DEV_LOG_UNKNOWN_PACKETS

src/procedures.c

@@ -254,8 +254,12 @@ void spawnPlayer (PlayerData *player) {
   // Sync client clock time
   sc_updateTime(player->client_fd, world_time);
 
-  // Give the player flight (for testing)
-  // sc_playerAbilities(player->client_fd, 0x04);
+  #ifdef ENABLE_PLAYER_FLIGHT
+  if (GAMEMODE != 1 && GAMEMODE != 3) {
+    // Give the player flight (for testing)
+    sc_playerAbilities(player->client_fd, 0x04);
+  }
+  #endif
 
   // Calculate player's chunk coordinates
   short _x = div_floor(player->x, 16), _z = div_floor(player->z, 16);