GenericProject: Make dependency on CppTools optional

Especially in the light of the language server, the generic project is
currently the project one can use for language servers that require a
"project workspace".

Makes it possibly to run Qt Creator with
"-noload CppTools" if you still want to use generic
projects with some other language.

Change-Id: Ib9059289a2db4c44c0c1060a02fcdafacb885fbd
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/cppprojectupdater.cpp

@@ -101,4 +101,14 @@ void CppProjectUpdater::onProjectInfoGenerated()
     QTC_CHECK(future != QFuture<void>());
 }
 
+CppProjectUpdaterFactory::CppProjectUpdaterFactory()
+{
+    setObjectName("CppProjectUpdaterFactory");
+}
+
+CppProjectUpdaterInterface *CppProjectUpdaterFactory::create()
+{
+    return new CppProjectUpdater;
+}
+
 } // namespace CppTools