This reverts commit 8c017c79c5736c9e45e635df210e08550287646d.
1.22 was the correct pkg-config version. It's only the subproject
version that was wrong. Since we bumped libva.wrap to 2.22 version, h266
is now always available when using the subproject.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8800>