build(zig): use LLVM for building nlua0

problem: https://codeberg.org/ziglang/zig/issues/31272
solution: set `.use_llvm = true` until the next zig release

src/build_lua.zig

@@ -23,6 +23,7 @@ pub fn build_nlua0(
             .optimize = optimize,
             .link_libc = true,
         }),
+        .use_llvm = true,
     });
     const nlua0_mod = nlua0_exe.root_module;