Avoid using QSKIP in lieu of compile-time checks

Avoid using QSKIP in lieu of compile-time checks

QSKIP is intended to be used to skip test functions that are found at
run-time to be inapplicable or unsafe.  If a test function can be
determined to be inapplicable at compile-time, the entire test function
should be omitted instead of replacing the body of the test function
with a QSKIP, which only serves to slow down test runs and to inflate
test run-rates with empty, inapplicable tests.

Task-number: QTQAINFRA-278

Change-Id: I582732e3dd657df834f9a98fd52d7ee368f2f29b
Reviewed-on: http://codereview.qt-project.org/5946
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>