configure: Fix errors in test for__sync_fetch_and_and
The old test code raises two compiler warnings which are errors since commit 417c9d72. These errors could result in compilations with compiler flag -march486 (so all nice features of newer processors got lost). Signed-off-by: NStefan Weil <sw@weilnetz.de> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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