[libc-coord] Re: Expose 'array_length()' macro in <sys/param.h>

[Florian Weimer]

* Jonathan Wakely:

>>#  define array_length(arr)	(std:size(arr))
>
> C++ programmers will not accept a macro for this.

I think we need a macro for C++98 support because there is no other way
to produce constant expression.

Note that this intended for C programs compiled in C++ mode.  As pointed
out, new C++ code should rather use std::size.

Thanks,
Florian
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