Cleaning up those that are trivial to remove because they have direct
replacements.
The QLabel changes to the pixmap/picture getters provide the following
migration path:
QPixmap *ppix = l->pixmap(); // up to 5.15, warns in 5.15
QPixmap pval = l->pixmap(Qt::ReturnByValue); // new in 5.15, works in 6
QPixmap pixmap = l->pixmap(); // from Qt 6 on
The overload with argument can be deprecated after the first LTS or
so.
Change-Id: I8494ceeea55b2aeda0bd340640ad95cb7c91f7d6
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
714409b23c