Change QQuickRenderControlPrivate from autotest to private export

There are legitimate cases for using the private class, the number one
case being Design Studio where QQuickRenderControl and QRhi are used
together. At the moment things work presumably because only member
variables are accessed, and that works even in builds that do not
have the member functions exported. Fix this up to be future proof.

Change-Id: I054deb31607ca8c95fccb2f5988dde6f0a9c372a
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
(cherry picked from commit 718472d8e1e30fe2b0bc0e3b514ea0ed20259737)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions