fix hardcode target flag (!1) · Merge requests · Arch Linux / Packaging / Packages / legba · GitLab

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Refer to latest guideline in wiki: https://wiki.archlinux.org/title/Rust_package_guidelines#Prepare
Facilitate the portability to platform like RISC-V, which should uses riscv64gc-unknown-linux-gnu for packaging (rather than riscv64-unknown-linux-gnu when use hardcode $CARCH)