Wrap rustc commands with sccache when building native build scripts. More interesting will be using sscache for compiling for the target architecture, but sccache currently refuses to cache with --sysroot. This can be optimized further later on, get some initial support for sccache in here first. While at it, tweak the -vV logic to also support -V, start using semver with this and add myself as maintainer of the package. [ci:skip-build]: already built successfully in CI