/usr/lib/libmaliit-plugins.so is in maliit-framework-dev 0.99.1+git20151118+62bd54b-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libmaliit-plugins.so.0.99.1
/usr/lib/libmaliit-plugins.so.0.99.1