avoid two GCC11 warnings

[Jim Meyering]

Building grep with GCC11, I noticed some new warnings.
Fixed with the just-pushed attached patches.

0002-setlocale-tests-do-not-trigger-gcc-s-Wanalyzer-possi.patch
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0001-raise-tests-avoid-GCC-11-s-new-exit-from-signal-hand.patch

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