Pass correct licence path into plugins build.

Change-Id: I429f505fe870130067e0ba1be73973db335c9f35
Reviewed-on: http://gerrit.dmdirc.com/2731
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Update submodules: plugins (new commits)

plugins:
    9538500 Chris Smith <chris@dmdirc.com>
            Allow the clover licence to be set explicitly.

            Gerrit: http://gerrit.dmdirc.com/2732

Change-Id: Id6e8c87f639eb988646ebfb659849c9466c0395d