There are not many cases you would want to do this but one is if you
want to use a test friendly compiler like gcc instead of a system
compiler like clang. Either way we should honour the users choice if
they have made it.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Warner Losh <imp@bsdimp.com>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Message-Id: <20210917162332.3511179-2-alex.bennee@linaro.org>