QNX: always create buffers for child windows

The QNX raster backend worked on the assumption that child windows were
sharing their parent toplevel window buffer instead, and thus did not
have a buffer of their own. This piece of code dates back from the
BlackBerry days, and I am guessing the motivation was to tackle
mmrenderer/foreign windows.

In fact, not having buffers causes QWindow to malfunction, as
independent buffers are required.

This patch makes sure every QQnxWindow has a backing buffer, as
expected. Foreign widnows shall be dealt with via different means.

Change-Id: I059ac4f8ac684b3577048f874f82b866f21326b1
Reviewed-by: James McDonnell <jmcdonnell@blackberry.com>

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