libstd-rs (rust) build failure: "No rust target defined for riscv64"

[duffolonious]

Failure for both the weston and plasma builds:

ERROR: libstd-rs-1.68.2-r0 do_rust_gen_targets: No rust target defined for riscv64
ERROR: Logfile of failure stored in: /home/yoctouser/bitbake/tmp/work/riscv64-pine64-linux/libstd-rs/1.68.2-r0/temp/log.do_rust_gen_targets.3377460
ERROR: Task (/home/yoctouser/layers/poky/../meta-lts-rust/recipes-devtools/rust/libstd-rs_1.68.2.bb:do_rust_gen_targets) failed with exit code '1'
NOTE: Tasks Summary: Attempted 3318 tasks of which 3302 didn't need to be rerun and 1 failed.

[duffolonious]

OK, running the patch commented out in setup.sh fixes the problem:

# rustpatch=`md5sum layers/poky/meta/lib/oe/rust.py | awk '{print $1;}'`
# if [ ! $rustpatch = "717271b44ab7b5eb803d088591a82157" ]; then
#       echo "Patching Rust Support in Poky"
#       patch -p1 < patches/rust.patch
#       echo ""
# fi