devel/ruby-pkg-config: update to 1.3.4

== 1.3.4 - 2019-02-19

=== Fixes

  * Fixed 32bit MinGW Ruby detection.
    [GitHub:ruby-gnome2/ruby-gnome2#1274][Reported by noanoa07]

=== Thanks

  * noanoa07

== 1.3.3 - 2019-02-10

=== Improvements

  * Improved MSYS2 detection on Windows.
    [GitHub#16][Reported by dsisnero]

=== Thanks

  * dsisnero

(taca)