Converted libmar into static library and removed duplicate code.

Change-Id: I51c58ae9a6a1f1128422b4a79491d0cd62e6ced6
Reviewed-on: https://gerrit.libreoffice.org/23312Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>