clang-format: avoid namespaces to be added
would be only be done in clang > 6 but not in clang 5
thanks to see
@@ -33,7 +33,8 @@ ContinuationIndentWidth: 8
Cpp11BracedListStyle: false
DerivePointerAlignment: false
DisableFormat: false
-FixNamespaceComments: true
+#TODO: Set `FixNamespaceComments` to `true` after we switched to `clang-format-6` or newer.
+#FixNamespaceComments: true
IndentCaseLabels: false
IndentWidth: 8
IndentWrappedFunctionNames: false
