CppEditor: Do not highlight C++ and Qt keywords for C

Task-number: QTCREATORBUG-2818
Task-number: QTCREATORBUG-18004
Change-Id: Ibca60a1711c827dd8b4c0486bff3d49b19a61d8b
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/libs/3rdparty/cplusplus/Token.h

@@ -407,6 +407,16 @@ struct LanguageFeatures
         return features;
     }
 
+    bool operator==(const LanguageFeatures &other) const
+    {
+        return flags == other.flags;
+    }
+
+    bool operator!=(const LanguageFeatures &other) const
+    {
+        return flags != other.flags;
+    }
+
     union {
         unsigned int flags;
         struct {