CMake: Show a message when configuring examples

This somewhat indicates the progress of configuring a specific
repo and the slower period of time when configuring examples
in-tree.

Pick-to: 6.5
Change-Id: I643536c4ebc865933730b7af2a1d0c56bbbf2912
Reviewed-by: Amir Masoud Abdol <amir.abdol@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

cmake/QtBuildInternals/QtBuildInternalsConfig.cmake

@@ -624,6 +624,7 @@ macro(qt_build_repo_impl_examples)
     if(QT_BUILD_EXAMPLES
             AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/examples/CMakeLists.txt"
             AND NOT QT_BUILD_STANDALONE_TESTS)
+        message(STATUS "Configuring examples.")
         add_subdirectory(examples)
     endif()
 endmacro()