Xcode: Explicitly specify default native architecture on macOS
When CMAKE_OSX_ARCHITECTURES
is not specified, we add the Xcode
setting ONLY_ACTIVE_ARCH = YES
with the intention of targeting the
native architecture of the host. However, the default ARCHS
value
chosen by "Xcode 12 Universal Apps" includes multiple architectures.
Add an explicit ARCHS
setting with value $(NATIVE_ARCH_ACTUAL)
to tell Xcode to use the host's native architecture only.
Fixes: #20893 (closed)
Backport: release