Rename dist/changes-5.3 -> dist/changes-5.3.0

.. so we follow other modules/repositories pattern.

Change-Id: I2887dbffc8163fbf4bbe61028f786066c3610be4
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Remove unnecessary private export macro

This was discovered during a header review of Qt 5.3.

Change-Id: Id852deb6fb5eadb43e643ac25e3b52dad7f7dd59
Reviewed-by: Liang Qi <liang.qi@digia.com>
Reviewed-by: Aaron McCarthy <mccarthy.aaron@gmail.com>