The test has a check that the static linker supports the new option,
but it assumed the Xcode 16 linker also meant it was running on
macOS 15 and the dynamic linker would honor dependencies flagged
this way. But Xcode 16 can be run on macOS 14.5, so we need to
skip the test in that combination.
Add comments and a test for delay-init libraries on macOS. I originally
added the support in 954d00e87cdd77d0e9e367be52e62340467bd779 a month
ago, but without these additional clarifications.
rdar://126885033