Rust code dosen' t builds on rust latest using rustup

[oktailb]

Hello,

Some build errors appears when build the rust part on driver-proxy and valve-pm modules
I have fixed and tested successfully the following modifications, simply encapsulating the return types to match new interfaces/prototypes
Since I am not a rust expert, it may exists a more elegant way

VivePro2-Linux-Driver-rust-latest.patch

Note : I have also meet the upside down issue, it was maybe related to the absence of these modules because after the build success, the upside down problems solve immediately

Thanks