python-lmdb: new package

Signed-off-by: Mauro Condarelli <mc5686@mclink.it>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
[Thomas:
 - switch to Github, which has a LICENSE file. The issue was reported
   upstream: https://github.com/dw/py-lmdb/issues/108

. Then added the
   <pkg>_LICENSE_FILES variable.
 - bump version to 0.89 (instead of 0.88)
 - indicate the proper license, following the SPDX code for the
   OpenLDAP 2.8 license.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>