Remove unnecessary APPLE specific code (#1188)

To reduce differences between tests, remove APPLE specific code from
unary tests as no other test have similar logic.

Ensure gMeasureTimes is consistently initialised regardless of operating
systems to ensure a consistent command line interface.

The remaining APPLE specific pieces of code relate either to include
paths, or to the implementation of PreventSleep(), ResumeSleep() and
GetTime(). Those are not removed in this commit.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>
3 files changed