WasmFS: Enable wasm64.test_unistd_access under wasmfs (#23203)

Fix the signatures of several native wasmfs exports. These are only
needed/relevant under wasm64.

Author: sbc100

test/test_core.py

@@ -5882,7 +5882,7 @@ def test_sigaction_default(self, signal, exit_code, assert_identical):
     )
 
   @crossplatform
-  @also_with_nodefs_both
+  @with_all_fs
   def test_unistd_access(self):
     nodefs = '-DNODEFS' in self.emcc_args or '-DNODERAWFS' in self.emcc_args
     if self.get_setting('WASMFS'):

tools/emscripten.py

@@ -1066,6 +1066,9 @@ def create_pointer_conversion_wrappers(metadata):
     '__cxa_get_exception_ptr': 'pp',
     '_wasmfs_write_file': '_ppp',
     '_wasmfs_mknod': '_p__',
+    '_wasmfs_symlink': '_pp',
+    '_wasmfs_chmod': '_p_',
+    '_wasmfs_lchmod': '_p_',
     '_wasmfs_get_cwd': 'p_',
     '_wasmfs_identify': '_p',
     '_wasmfs_read_file': 'pp',