Add completion for function signatures.

You now get the function parameters as a completion suggestion when
declaring or defining a function. The tooltip for function calls
is unchanged.

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
(cherry picked from commit 202fef42ca)

src/plugins/cpptools/cppcodecompletion.h

@@ -114,7 +114,8 @@ private:
     bool completeInclude(const QTextCursor &cursor);
 
     bool completeConstructorOrFunction(const QList<CPlusPlus::TypeOfExpression::Result> &,
-                                       const CPlusPlus::LookupContext &);
+                                       const CPlusPlus::LookupContext &,
+                                       int endOfExpression);
 
     bool completeMember(const QList<CPlusPlus::TypeOfExpression::Result> &,
                         const CPlusPlus::LookupContext &context);