luajit2: RISC-v Architecture not supported

[peterwillcn]

cp jsonc.so /workdir/build_dir/target-riscv64_riscv64_musl/luci-lib-jsonc/ipkg-install/usr/lib/lua/luci/jsonc.so
lj_arch.h:506:2: error: #error "No target architecture defined"

openwrt/packages#28040

[alerque]

You can use the fork/branch from #236 for RISC-V support until such a time as this project or the upstream one start taking the architecture seriously enough to mainline it. 😉