Fix CMake to support device_and_simulator iOS builds

qmake allows compiling a single cpp files while targeting both a device SDK and a simulator SDK.

This is accomplished by specifying multiple flags like -m$${version_identifier}-version-min flags, -syslibroot, -isysroot prepepended by an -Xarch_

flag.

CMake currently lacks support for that, which means it is not possible build and link a library targeting both device and simulators in one build pass.

I expect that changes in CMake pertaining to CMAKE_OSX_ARCHITECTURES, find_package / find_library will be needed.

Upstream bug https://gitlab.kitware.com/cmake/cmake/issues/19534