Series of patches to cargo.eclass
most important chages are:
1. minimum rust/cargo version bump, which will propogate to all
consumers.
2. introduction of custom build profile (similar to what we do in Cmake)
This will allow to consistently specify build options, yeat allows
overrides from users or developers via envvars and/or args.
PR:
https://github.com/gentoo/gentoo/pull/29510
PS: still WIP, but most changes are ready.
Another upcoming change is to allow running 'cargo update' to be able to
bump vulnerable/outdated pkgs listed in CRATES.
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