Fix set of valid env flags

Author: kriszyp

dependencies/lmdb/libraries/liblmdb/lmdb.h

@@ -378,6 +378,7 @@ typedef void (MDB_sum_func)(const MDB_val *src, MDB_val *dst, const MDB_val *key
 #define MDB_SAFE_RESTORE	0x800
 	/** Track metrics for this env */
 #define MDB_TRACK_METRICS	0x400
+	/** Use the newest free space first */
 #define MDB_USE_NEW_FREESPACE	0x200
 	/** Use the overlapping sync strategy */
 #define MDB_OVERLAPPINGSYNC_SYNC = 0x02

dependencies/lmdb/libraries/liblmdb/mdb.c

@@ -6720,7 +6720,7 @@ mdb_env_envflags(MDB_env *env)
 	 */
 #define	CHANGEABLE	(MDB_NOSYNC|MDB_NOMETASYNC|MDB_MAPASYNC|MDB_NOMEMINIT)
 #define	CHANGELESS	(MDB_FIXEDMAP|MDB_NOSUBDIR|MDB_RDONLY| \
-	MDB_WRITEMAP|MDB_NOTLS|MDB_NOLOCK|MDB_NORDAHEAD|MDB_PREVSNAPSHOT|MDB_REMAP_CHUNKS|MDB_OVERLAPPINGSYNC|MDB_SAFE_RESTORE|MDB_TRACK_METRICS)
+	MDB_WRITEMAP|MDB_NOTLS|MDB_NOLOCK|MDB_NORDAHEAD|MDB_PREVSNAPSHOT|MDB_REMAP_CHUNKS|MDB_OVERLAPPINGSYNC|MDB_SAFE_RESTORE|MDB_TRACK_METRICS|MDB_USE_NEW_FREESPACE)
 #define EXPOSED		(CHANGEABLE|CHANGELESS | MDB_ENCRYPT)
 
 #if VALID_FLAGS & PERSISTENT_FLAGS & EXPOSED