Fix build given -Clinker-features=-lld is now stable

Author: nbdd0121

.cargo/config.toml

@@ -1,2 +1,2 @@
 [target.x86_64-unknown-linux-gnu]
-rustflags = ["-Zlinker-features=-lld"]
+rustflags = ["-Clinker-features=-lld"]

build.rs

@@ -24,6 +24,7 @@ fn main() -> Result<()> {
     // Run cargo to compile the eBPF program.
     let status = std::process::Command::new("cargo")
         .current_dir("cgroup_device_filter")
+        .env_remove("CARGO_ENCODED_RUSTFLAGS")
         .args(["build", "--release"])
         .status()?;