* If a valid team id is provided, automatic code sign management is
enabled
* Different deployment targets for x86_64 and arm64 are enabled for
Xcode-based builds
* Codesign identity and code-sign style are set globally
CMake seems to set either `CMAKE_OSX_ARCHITECTURES` and
`CMAKE_OSX_DEPLOYMENT_TARGET` implicitly to empty cache variables when
not defined explicitly on the commandline or via a GUI.
Setting a default thus requires the `FORCE` flag to overwrite these
empty defaults with our desired results. The branches ensure that user-
provided non-empty values are not overwritten as well.
