Embedded lmdb

This MR changes few things:

• lmbd:MDB_0.9.14 is embedded in src/libknot/internal/namedb/
• embedded LMDB is used when --with-lmdb=no is passed to ./configure
• otherwise shared LMDB is searched for and used (default)

This should make all parties happy.

@mvavrusa Just change your bootstrap command to call ./configure --with-lmdb=no and it should work for you on platforms without lmdb.

No OpenBSD yet though.

Added 1 new commit:

• 68f3d2b2 - Fix yes/auto for systemd integration

Added 1 new commit:

• 79eec465 - Add -I for embedded LMDB

mentioned in commit f3da8a3a

Status changed to merged

If it isn't built-in, then lmdb must be present in the .pc file otherwise I don't know whether should I search for it or knot. :scuba_diver: