fixup! remove libstdc++ case

Author: Michael137

lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/atomic/TestDataFormatterStdAtomic.py

@@ -67,9 +67,3 @@ def do_test(self):
     def test_libcxx(self):
         self.build(dictionary={"USE_LIBCPP": 1})
         self.do_test()
-
-    @skipIf(compiler=["gcc"])
-    @add_test_categories(["libstdcxx"])
-    def test_libstdcxx(self):
-        self.build(dictionary={"USE_LIBSTDCPP": 1})
-        self.do_test()