Add <module>-config[-p].h files to the module sources

<module>-config[-p].h files need to be added to the CMake source tree

Amends 8539e641f6

Task-number: QTBUG-103196
Change-Id: I8baaa672ad869da8a030d890da8bdea5bd8c7794
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

cmake/QtModuleHelpers.cmake

@@ -641,6 +641,12 @@ function(qt_internal_add_module target)
         )
         include(${configureFile})
         qt_feature_module_end("${target}")
+
+        qt_internal_extend_target("${target}"
+            SOURCES
+                "${CMAKE_CURRENT_BINARY_DIR}/${module_config_header}"
+                "${CMAKE_CURRENT_BINARY_DIR}/${module_config_private_header}"
+        )
     endif()
 
     if(NOT arg_HEADER_MODULE)