* disable mimalloc on illumos, in part because it immediately segfaults,
but also because we prefer libumem and link it into all Rust binaries
* switch from fs2 (unmaintained crate) to fs4 which provides the same
interface and has wider platform support
* fixing up error handling for prctl calls
* minor clippy lintypoos
* making clippy happier
* clippizing a test
* more clippy-calming
* adding tpm-udev to ubuntu flows for testing
* rebuilt wasm
* moving from rg to grep because someone doesn't like nice things
* such clippy like wow
* clippy config to the rescue
