Anton Khirnov 9177556bb9 doc/developer.texi: update the language feature section
It is currently very out of touch with reality.

* declare we are using C99 fully, rather than C90 plus extensions
* mention our use of stdatomic.h
* mention forbidden C99 features, like VLAs and complex numbers
2022-11-23 10:41:06 +01:00
..
2022-06-13 22:42:55 +02:00