The simulator build of Qt for iOS is currently x86_64 only, instead
of universal builds with an arm64 slice as well, since we don't
support xcframeworks. This means we can't rely on Xcode's default
simulator arch settings, which on an Apple Silicon Mac will be
arm64.
Instead we override the simulator arch, like we do for qmake.
Pick-to: 6.4 6.3 6.2
Change-Id: I8b52389db1b83f4f9679c724bcde53b44dbc76f1
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
6ec21881dd