Downgrade cargo-binutils to 0.2.0

Author: wyfcyx

os/Makefile

@@ -36,7 +36,7 @@ build: env $(KERNEL_BIN) $(FS_IMG)
 
 env:
 	(rustup target list | grep "riscv64gc-unknown-none-elf (installed)") || rustup target add $(TARGET)
-	cargo install cargo-binutils
+	cargo install cargo-binutils --vers ~0.2
 	rustup component add rust-src
 	rustup component add llvm-tools-preview