DOCS/contribute.md: expand on recommended C99 usage

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wm4 2019-09-21 16:35:45 +02:00
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@ -152,7 +152,7 @@ General coding
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- Use C99. Also freely make use of C99 features if it's appropriate, such as
stdbool.h.
stdbool.h. (Except VLA and complex number types.)
- Don't use GNU-only features. In some cases they may be warranted, if they
are optional (such as attributes enabling printf-like format string checks).
But in general, standard C99 should be used.