add buildsystem/qmake changelog

Change-Id: I7fc7d335acd4f6e98517d240cc1f9bd3d035857f
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
update changelog for QtSql 5.3.1

Change-Id: I06bf38a0c005ad4c13fb4db611847c3408060176
Reviewed-by: Andy Shaw <andy.shaw@digia.com>