protocol: remove build script

Author: numas13

Cargo.lock

@@ -20,6 +20,3 @@ net = ["std"]
 [dependencies]
 log.workspace = true
 bitflags.workspace = true
-
-[build-dependencies]
-autocfg = "1.3"

protocol/Cargo.toml

@@ -7,7 +7,7 @@
 //! Xash3D protocol between clients, servers and masters.
 
 #![cfg_attr(all(not(feature = "std"), not(test)), no_std)]
-#![cfg_attr(all(doc, has_doc_auto_cfg), feature(doc_auto_cfg))]
+#![cfg_attr(all(doc, docsrs), feature(doc_auto_cfg))]
 
 #[cfg(feature = "alloc")]
 extern crate alloc;