Add support for LazyLock

build.rs

@@ -0,0 +1,10 @@
+use autocfg::AutoCfg;
+
+fn main() {
+    // To avoid bumping MSRV unnecessarily, we can sniff certain features. Reevaluate this on major
+    // releases.
+    let ac = AutoCfg::new().unwrap();
+    ac.emit_has_path("std::sync::LazyLock");
+
+    autocfg::rerun_path("build.rs");
+}