[meta-lts-mixins][kirkstone/rust-1.68 RFC v2 PATCH 0/2] Proposed Kirkstone Rust 1.68 mixin

[Scott Murray <scott.murray@konsulko.com>]

These patches comprise my proposed kirkstone/rust-1.68 branch for the
meta-lts-mixins repo.  The initial check-in backports the Rust 1.68.1
support from mickledore branch as it stands for 4.2.0, then I have
separately applied the Rust 1.68.2 upgrade from master that Steve has
queued up for Mickledore.

The README in the initial check-in provides some details on the
backporting of the librsvg recipe versus not doing so for
python3-cryptography.  I did double-check this again, and I do not see
a way to retrofit the librsvg recipe with a bbappend, as the bit to be
changed is in a do_compile:prepend.  The other recipe that I've
discovered with a similar issue is mozjs-91 in meta-openembedded; it
effectively needs a replacement do_compile to pick up the RUST_HOST_SYS
change.  That could possibly be handled with a bbappend in dynamic layer
in this mixin, but I have decided to consider it outside the scope for
now.

v2: Remove Rust-related patches from master that Steve does not have
    queued for Mickledore. If they do later get backported, they can
    be re-added as required.

Alex Kiernan (1):
  rust: Upgrade 1.68.1 -> 1.68.2

Scott Murray (1):
  Initial check-in

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