Explicitly check that at least CMake 3.21 is used when building Qt or
when using Qt in a project.
This only affects macOS and iOS builds.
We check for 3.21 instead of 3.21.1 as described in the documentation
to avoid an error like:
Policy VERSION range "3.21.1...3.21" specifies a larger minimum than
maximum.
Until the technical limitation is addressed, if someone does end up
using 3.21.1, another existing check for "unsuitable" cmake versions
(as opposed to minimum required) will let them know they should use
something newer.
Amends 1cf3295cef321c9a587af2f2de7740c0cd3ca743.
Pick-to: 6.6
Fixes: QTBUG-114869
Change-Id: I2a479baaa63cfbe23af187cf0796e1c00042692b
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
9ef864f56f