[ITA] ruby-pkg-config 1.5.1

[Daisuke Fujimura]

Hello,

====

Cygportfile:
- https://cygwin.com/cgit/cygwin-packages/playground/tree/?h=ruby-pkg-config

Packages, logs:
- https://github.com/cygwin/scallywag/actions/runs/5068809911
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