C++: Use correct features for document parsing

Task-number: QTCREATORBUG-8007
Change-Id: Ic96aaa433442812a99bac9d16bb9124d66762e8c
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

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

@@ -396,6 +396,12 @@ public:
 struct LanguageFeatures
 {
     LanguageFeatures() : flags(0) {}
+    static LanguageFeatures defaultFeatures()
+    {
+        LanguageFeatures features;
+        features.flags = 0xffffffff; // Enable all flags
+        return features;
+    }
 
     union {
         unsigned int flags;