简化条件编译

vnt/build.rs

@@ -1,4 +1,17 @@
+use cfg_aliases::cfg_aliases;
+
 fn main() {
+    cfg_aliases! {
+        cipher: {
+            any(feature = "aes_gcm",
+            feature = "chacha20_poly1305",
+            feature = "server_encrypt",
+            feature = "aes_cbc",
+            feature = "aes_ecb",
+            feature = "sm4_cbc"
+        )},
+    }
+
     std::fs::create_dir_all("src/proto").unwrap();
     protobuf_codegen::Codegen::new()
         .pure()