[stable branch] meson: Disable options that require external deps by default
All these deps enable optional features in the x264 CLI, which we don't really need from our primary use-case: gst-build.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
All these deps enable optional features in the x264 CLI, which we don't really need from our primary use-case: gst-build.