gst-env: Use meson-uninstalled pkgconfig files if available
This allows people to use the development environment for building projects when glib is built as a subproject.
See also: !136 (closed), which will supersede this after the 1.18 release.
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This allows people to use the development environment for building projects when glib is built as a subproject.
See also: !136 (closed), which will supersede this after the 1.18 release.