When the detected SDK for CMAKE_OSX_SYSROOT and friends has the same
version as your current macOS system version, CMake helpfully doesn't
set CMAKE_OSX_DEPLOYMENT_TARGET. Unfortunately, in this case, swiftc
will default to macOS 10.4, which is absolutely ancient. Grab the target
triple from the -print-target-info JSON when CMAKE_OSX_DEPLOYMENT_TARGET
is not provided at configure time.
Instead of using a global setting, let's set this per-target. This
prevents conflicts when importing third-party dependencies that do
not tolerate the mode being "default".
At the same time, simplify CMakeLists magic for libraries that want to
include Swift code in the library. The Lib-less name of the library is
now always the module name for the library with any Swift additions,
extensions, etc. All vfs overlays now live in a common location to make
finding them easier from CMake functions. A new pattern is needed for
the Lib-less modules to re-export their Cxx counterparts.
