Log Message:
ruby-cairo: update to 1.16.2.

pkgsrc changes:
* Take maintainership.

Upstream changelog:
(from https://github.com/rcairo/rcairo/blob/v1.16.2/NEWS)

Release 1.16.2 (2018-10-31) Kouhei Sutou <kou@cozmixng.org>
============================================================

Improvements
------------

  * Stopped to provide fat gem for Windows. Windows users should use
    MSYS2 packages.

Release 1.16.1 (2018-10-31) Kouhei Sutou <kou@cozmixng.org>
============================================================

Improvements
------------

  * Added Cairo::Context#destroyed?.

Release 1.16.0 (2018-10-28) Kouhei Sutou <kou@cozmixng.org>
============================================================

Improvements
------------

  * Added support for cairo 1.16.0.

  * Removed Cairo::SkiaSurface.