13c0f44dd5
`gst/validate/validate.h` includes `gst/validate/gst-validate-media-info.h`, which in turn includes `gst/pbutils/pbutils.h` but `gstreamer-pbutils-1.0` was only listed in `Requires.private` field of `gstreamer-validate-1.0.pc`. This would cause projects linking against `gstreamer-validate-1.0.pc` to fail to find the headers when using alternative interpretation of pkg-config specification that only considers private dependencies for include path during static builds, such as the case e.g. on Nix. https://gitlab.freedesktop.org/pkg-config/pkg-config/-/issues/28 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8661>