add aarch64 support for HermitCore

Author: stlankes

src/libstd/Cargo.toml

@@ -50,7 +50,7 @@ dlmalloc = { version = "0.1", features = ['rustc-dep-of-std'] }
 [target.x86_64-fortanix-unknown-sgx.dependencies]
 fortanix-sgx-abi = { version = "0.3.2", features = ['rustc-dep-of-std'] }
 
-[target.x86_64-unknown-hermit.dependencies]
+[target.'cfg(all(any(target_arch = "x86_64", target_arch = "aarch64"), target_os = "hermit"))'.dependencies]
 hermit-abi = { version = "0.1", features = ['rustc-dep-of-std'] }
 
 [target.wasm32-wasi.dependencies]