(ITS#8913) Add meson build system to lmdb

[nacho.resa@gmail.com]

Full_Name: Ignacio Casal Quinteiro
Version: 
OS: 
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (54.239.6.177)


Meson is the new thing out there, maybe projects are already using it and allows
embedding in other projects apart from being fast, efficient and easier to
maintain than a Makefile.

On the following patch you can find a working meson build system which builds
lmdb:
https://github.com/wingtk/lmdb/commit/24b1b1ce2055b6a612603700bdcfc7ba3859fbfb