Explicitly define MDB_VL32 in sources

libraries/liblmdb/mdb.c

@@ -32,6 +32,8 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+#define MDB_VL32	1
+
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE 1
 #endif

libraries/liblmdb/midl.c

@@ -15,6 +15,7 @@
  * <http://www.OpenLDAP.org/license.html>.
  */
 
+#define MDB_VL32	1
 #include <limits.h>
 #include <string.h>
 #include <stdlib.h>