Sync Makefile and common syms (#676)

src/fieldmap.c

@@ -14,7 +14,7 @@ struct ConnectionFlags
     u8 east:1;
 };
 
-struct BackupMapLayout VMap;
+COMMON_DATA struct BackupMapLayout VMap = {0};
 EWRAM_DATA u16 gBackupMapData[VIRTUAL_MAP_SIZE] = {};
 EWRAM_DATA struct MapHeader gMapHeader = {};
 EWRAM_DATA struct Camera gCamera = {};