[RFA:] Fix test-suite regressions from PR62250 due to -latomic always added

[Mike Stump]

On Jan 7, 2015, at 6:32 PM, Hans-Peter Nilsson <hans-peter.nilsson@axis.com> wrote:
> PR62250 (r219171) was about some fortran tests that used atomic
> operations but failing on systems where -latomic is required.
> The fix was to always add -latomic.  That caused test-suite
> regressions for targets that don't have libatomic, but where the
> required operations are built-in (no separate PR entered, the
> fix below seemed simple enough).

> Ok to commit?

Ok.