Do never offer signature autocompletion for constructor calls.

They should always use the function parameter tooltip.

This fixes a bug where you were offered completion for
C foo( -> C foo(int x)
if C had a constructor taking int x.

Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

src/plugins/cpptools/cppcodecompletion.h

@@ -115,7 +115,7 @@ private:
 
     bool completeConstructorOrFunction(const QList<CPlusPlus::TypeOfExpression::Result> &,
                                        const CPlusPlus::LookupContext &,
-                                       int endOfExpression);
+                                       int endOfExpression, bool toolTipOnly);
 
     bool completeMember(const QList<CPlusPlus::TypeOfExpression::Result> &,
                         const CPlusPlus::LookupContext &context);