Updated: ruby-cairo-gobject 4.1.7

[Daisuke Fujimura via Cygwin-announce]

The following packages have been uploaded to the Cygwin distribution:

- https://cygwin.com/packages/summary/ruby-cairo-gobject-src.html
  - ruby-cairo-gobject
  - ruby-cairo-gobject-devel
  - ruby-cairo-gobject-doc