Make QMediaObjectPrivate as QObjectPrivate

Since QMediaObject is QObject, and it uses d_ptr,
it is sane to move QMediaObjectPrivate to QObjectPrivate
and use standard way of using private impl.

NOTE : If some users inherit from QMediaObjectPrivate in their code,
they probably initialize and delete d_ptr manually
which would cause a crash now.
But using QMediaObjectPrivate without QMediaObject should be considered
as incorrect usage.

Task-number: QTBUG-77630
Change-Id: I147e3b3dc67a8c2765b28f752db196b4d7fca224
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

0 files changed, 0 insertions, 0 deletions