meson: Check whether stdatomic.h is actually usable
cc.has_header('stdatomic.h') checks existence of the file but it may not guarantee whether it's actually usable. Note that there's the same check in "configure" file already.
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cc.has_header('stdatomic.h') checks existence of the file but it may not guarantee whether it's actually usable. Note that there's the same check in "configure" file already.