adressing feedback

Author: ZuseZ4

src/bootstrap/src/core/build_steps/compile.rs

@@ -1784,12 +1784,7 @@ impl Step for Assemble {
         };
 
         if let Some(enzyme_install) = enzyme_install {
-            let lib_ext = match env::consts::OS {
-                "macos" => "dylib",
-                "windows" => "dll",
-                _ => "so",
-            };
-
+            let lib_ext = std::env::consts::DLL_EXTENSION;
             let src_lib = enzyme_install.join("build/Enzyme/libEnzyme-19").with_extension(lib_ext);
             let libdir = builder.sysroot_libdir(build_compiler, build_compiler.host);
             let target_libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);