bump required taglib version to 1.11.1

Summary:
some of the functionality added in D12320 requires functions added only in TagLib 1.11, but the required version was not adjusted.
TagLib 1.11.1 was released on October 24, 2016

Reviewers: mgallien, svuorela

Reviewed By: svuorela

Subscribers: kde-frameworks-devel, Baloo

Tags: Frameworks, Baloo

Differential Revision: https://phabricator.kde.org/D15615