Although the header is available, and the compiler reports that the
standard library supports memory_resource, the feature is only
available on macOS 14 and iOS 17, as reported by
https://developer.apple.com/xcode/cpp/
As long as our deployment target is lower we can't unconditionally
use this feature. It's not clear whether the expectation is that
consumers of the standard library on these platforms will have to
runtime check their uses of these APIs.
Pick-to: 6.6 6.5
Task-number: QTBUG-114316
Change-Id: I50c1425334b9b9842b253442e2b3aade637783ea
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
f7c8ff511c