AudioGetCurrentHostTime has been present forever, so the test is not
enforcing a specific version of macOS. In fact the test was broken
since it was not linking against the coreaudio dependency; just remove it.
Fixes: 87430d5b13 ("configure, meson: move audio driver detection to Meson", 2021-10-14) Reported-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>