std.Build.Step.Run: Fix invocation syntax for Wasmtime 14+.

bytecodealliance/wasmtime#7384

Author: alexrp

lib/std/Build/Step/Run.zig

@@ -1004,8 +1004,8 @@ fn runCommand(
                     if (b.enable_wasmtime) {
                         try interp_argv.append(bin_name);
                         try interp_argv.append("--dir=.");
-                        try interp_argv.append(argv[0]);
                         try interp_argv.append("--");
+                        try interp_argv.append(argv[0]);
                         try interp_argv.appendSlice(argv[1..]);
                     } else {
                         return failForeign(run, "-fwasmtime", argv[0], exe);