We can't run them in the normal way, but we build the tests as static
archives, which we link into the single sal_cppunittester_all
executable. (Work in progress, so far just a part of the tests are
linked into it.)

There is no makefilery yet to actually construct a complete iOS app
bundle (.app directory), so just copy (in this case) the
sal_cppunittester_all iOS executable on top of the executbale some
dummy iOS app you build in Xcode... works fine, can be debugged that
way.