Add Rust build argument modification to diy-part2.sh

Author: tosaki

diy-part2.sh

@@ -3,3 +3,13 @@ sed -i 's/192.168.1.1/192.168.10.10/g' package/base-files/files/bin/config_gener
 
 # change tr3000v1 ubi size
 git apply 999-dts-cudy-tr3000-v1-modification.patch
+
+# Copied from https://github.com/Shuery-Shuai/ImmortalWrt-BPI-R4-Firmware/blob/4c275df675faa2d92967a1db4dc96807adef15f3/diy-part2.sh#L210
+# Set Rust build arg llvm.download-ci-llvm to false.
+RUST_MAKEFILE="feeds/packages/lang/rust/Makefile"
+if [[ -f "${RUST_MAKEFILE}" ]]; then
+  printf "Modifying %s...\n" "${RUST_MAKEFILE}"
+  sed -i 's/--set=llvm\.download-ci-llvm=true/--set=llvm.download-ci-llvm=false/' "${RUST_MAKEFILE}"
+else
+  echo "File ${RUST_MAKEFILE} does not exist." >&2
+fi