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Workaround faulty stdatomic.h header detection on Oracle Linux 7

Ondřej Surý requested to merge 4270-use-HAVE_STDATOMIC_H-for-stdatomic.h-header-detection-9.18 into bind-9.18

Oracle Linux 7 sets STDC_VERSION to 201112L, but doesn't define STDC_NO_ATOMICS, so we try to include <stdatomic.h> without the header present in the system. Since we are already detecting the header in the autoconf, use the HAVE_STDATOMIC_H for more reliable detecting whether <stdatomic.h> header is present.

Closes #4270 (closed)

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