cmake pkg_get_variable(GI_GIRDIR) examples

ornladios/ADIOS2 cmake/upstream/FindPkgConfig.cmake :823 

pkg_get_variable(GI_GIRDIR gobject-introspection-1.0 girdir)

ornladios/ADIOS2 thirdparty/EVPath/EVPath/cmake/upstream/FindPkgConfig.cmake :100 

pkg_get_variable(GI_GIRDIR gobject-introspection-1.0 girdir)

fontforge/fontforge cmake/backports/3.15.7/FindPkgConfig.cmake :723 

pkg_get_variable(GI_GIRDIR gobject-introspection-1.0 girdir)