fix(netbench): enable virtio-net

Author: mkroening

benches/netbench/run.sh

@@ -18,6 +18,7 @@ hermit() {
     cargo build --manifest-path "$netbench_dir"/Cargo.toml --bin $bin \
         -Zbuild-std=core,alloc,std,panic_abort -Zbuild-std-features=compiler-builtins-mem \
         --target x86_64-unknown-hermit \
+        --features hermit/virtio-net \
         --release
 
     echo "Launching $bin image on QEMU"