mlua-sys: Fix wrong cfg flags in luaL_makeseed (Lua 5.5)

Author: khvzak

mlua-sys/Cargo.toml

@@ -46,4 +46,4 @@ luajit-src = { version = ">= 210.7.0, < 210.8.0", optional = true }
 luau0-src = { version = "0.20.0", optional = true }
 
 [lints.rust]
-unexpected_cfgs = { level = "allow", check-cfg = ['cfg(raw_dylib)'] }
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(raw_dylib)'] }

mlua-sys/src/lua55/lauxlib.rs

@@ -190,10 +190,11 @@ pub unsafe fn luaL_loadbufferenv(
     status
 }
 
+#[allow(unused_variables, unreachable_code)]
 pub unsafe fn luaL_makeseed(L: *mut lua_State) -> c_uint {
-    #[cfg(macos)]
+    #[cfg(target_os = "macos")]
     return libc::arc4random();
-    #[cfg(linux)]
+    #[cfg(target_os = "linux")]
     {
         let mut seed = 0u32;
         let buf = &mut seed as *mut _ as *mut c_void;