disable test_fs_writeFile in non-emcc modes

tests/test_core.py

@@ -4260,7 +4260,8 @@ def process(filename):
     self.do_run_from_file(src, out)
 
   def test_fs_writeFile(self):
-    self.emcc_args += ['-s', 'DISABLE_EXCEPTION_CATCHING=1']
+    if self.emcc_args is None: return self.skip('requires emcc')
+    self.emcc_args += ['-s', 'DISABLE_EXCEPTION_CATCHING=1'] # see issue 2334
     src = path_from_root('tests', 'fs', 'test_writeFile.cc')
     out = path_from_root('tests', 'fs', 'test_writeFile.out')
     self.do_run_from_file(src, out)