Prebuilt blobs for build-time deps?

Yes, everything else is being built from source (including a forked libpipewire built statically to work around an ancient version in steamrt3). The rest of the dependencies should be stuff that’s in the SDKs. (There are technically some blobs in one of the git submodules becase upstream’s repo is kind of messy with their example projects, but it’s just junk, not used during the build. I assume that’s not a problem.)