Bug 831633 - Back out 1c7bdeefa8ee (bug 830315) for introducing hundreds of non-virtual dtor warnings. r=waldo

mfbt/Attributes.h

@@ -66,14 +66,12 @@
 #  if __has_extension(cxx_constexpr)
 #    define MOZ_HAVE_CXX11_CONSTEXPR
 #  endif
-#  if __cplusplus >= 201103L
-#    if __has_extension(cxx_deleted_functions)
-#      define MOZ_HAVE_CXX11_DELETE
-#    endif
-#    if __has_extension(cxx_override_control)
-#      define MOZ_HAVE_CXX11_OVERRIDE
-#      define MOZ_HAVE_CXX11_FINAL         final
-#    endif
+#  if __has_extension(cxx_deleted_functions)
+#    define MOZ_HAVE_CXX11_DELETE
+#  endif
+#  if __has_extension(cxx_override_control)
+#    define MOZ_HAVE_CXX11_OVERRIDE
+#    define MOZ_HAVE_CXX11_FINAL         final
 #  endif
 #  if __has_extension(cxx_strong_enums)
 #    define MOZ_HAVE_CXX11_ENUM_TYPE