CPlusPlus: Provide information about the "static" specifier

... to the function type.
This fixes the issue for function *definitions*. For function
*declarations*, we need to amend the parser.

Task-number: QTCREATORBUG-24894
Change-Id: I02043d8b974c2c64dcd739c7e05ce44fd277b5d3
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/3rdparty/cplusplus/Symbols.cpp

@@ -405,6 +405,7 @@ FullySpecifiedType Function::type() const
     FullySpecifiedType ty(const_cast<Function *>(this));
     ty.setConst(isConst());
     ty.setVolatile(isVolatile());
+    ty.setStatic(isStatic());
     return ty;
 }