I took a look at updating rust-gstreamer to 0.17.4 (this is not the
latest version, but it is the version corresponding to the current rust
gtk stack in Debian) and hence solving the dependency issues with the
current package. There were two unsatisfied dependencies: muldiv 1.x and
pretty-hex 0.2. The former simply needed an update to the latest
upstream (there are no other reverse dependencies in Debian), but the
latter looks like it will need packaging from scratch.
