Fix test_embind_tsgen_memory64_pthread (#26017)

I noticed this test was failing locally. This test was being skipped in
CI because the `other` runner skips all wasm64 tests and the the
`wasm64` runner it only runs `other.*_wasm64` tests.

The `_emscripten_thread_mailbox_await` function unconditionally depends
on `waitAsyncPolyfilled` to the symbol needs to at least always exist.

Author: sbc100

src/lib/libatomic.js

@@ -62,6 +62,8 @@ addToLibrary({
     return { async: true, value: promise };
   };
 }`,
+#else
+  $waitAsyncPolyfilled: false,
 #endif
 
   $polyfillWaitAsync__internal: true,

test/other/embind_tsgen_memory64.cpp test/other/embind_tsgen_wasm64.cpptest/other/embind_tsgen_memory64.cpp renamed to test/other/embind_tsgen_wasm64.cpp

@@ -3663,13 +3663,13 @@ def test_embind_tsgen_bigint(self):
     'pthread': [['-pthread']],
   })
   @requires_wasm64
-  def test_embind_tsgen_memory64(self, args):
-    # Check that when memory64 is enabled longs & unsigned longs are mapped to bigint in the generated TS bindings
-    self.run_process([EMXX, test_file('other/embind_tsgen_memory64.cpp'),
-                      '-lembind', '--emit-tsd', 'embind_tsgen_memory64.d.ts', '-sMEMORY64'] +
+  def test_embind_tsgen_wasm64(self, args):
+    # Check that when wasm64 is enabled longs & unsigned longs are mapped to bigint in the generated TS bindings
+    self.run_process([EMXX, test_file('other/embind_tsgen_wasm64.cpp'),
+                      '-lembind', '--emit-tsd', 'embind_tsgen_wasm64.d.ts', '-sMEMORY64'] +
                      args +
                      self.get_cflags())
-    self.assertFileContents(test_file('other/embind_tsgen_memory64.d.ts'), read_file('embind_tsgen_memory64.d.ts'))
+    self.assertFileContents(test_file('other/embind_tsgen_wasm64.d.ts'), read_file('embind_tsgen_wasm64.d.ts'))
 
   @requires_jspi
   def test_embind_tsgen_jspi(self):