mariadb: update to 5.5.38

mariadb: update to 5.5.38

* Upstream switched from autotools to cmake
* Separate build dir and parallel make now work
* Library versioning no longer used for plugins; other libtool cruft
  gone
* Proper upstream initscript
* Plugins moved from client library package to mariadb-server package
  (matches how Fedora packages these)

(From meta-openembedded rev: e751af9f900834759e59ad2b46a7118a508069e4)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>