manual: Update the _ISOC99_SOURCE description.
The current description refers to ISO C99 not being widely adopted, which it is believed to be now. * manual/creature.texi (_ISOC99_SOURCE): Update the dated description.
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The current description refers to ISO C99 not being widely adopted, which it is believed to be now. * manual/creature.texi (_ISOC99_SOURCE): Update the dated description.