CPackWIX: Support patching of root <Feature> elements.

Modules/CPackWIX.cmake

@@ -148,8 +148,10 @@
 #  Currently fragments can be injected into most
 #  Component, File and Directory elements.
 #
-#  The special Id ``#PRODUCT`` can be used to inject content
-#  into the ``<Product>`` element.
+#  The following additional special Ids can be used:
+#
+#  * ``#PRODUCT`` for the ``<Product>`` element.
+#  * ``#PRODUCTFEATURE`` for the root ``<Feature>`` element.
 #
 #  The following example illustrates how this works.
 #

Source/CPack/WiX/cmCPackWIXGenerator.cxx

@@ -474,6 +474,7 @@ bool cmCPackWIXGenerator::CreateWiXSourceFiles()
 
   featureDefinitions.AddAttribute("Title", cpackPackageName);
   featureDefinitions.AddAttribute("Level", "1");
+  this->Patch->ApplyFragment("#PRODUCTFEATURE", featureDefinitions);
 
   const char* package = GetOption("CPACK_WIX_CMAKE_PACKAGE_REGISTRY");
   if(package)