Re: Making MSVC/clang-cl succeed AC_PROG_CC C11 discovery

> +*** AC_PROG_CC no longer tests for VLAs, or whether __STDC__ is defined.
> +  This ports better to MSVC, which does not support variable length
> +  arrays and does not define __STDC__.

Suggestion:

```
*** AC_PROG_CC no longer tests for variable length arrays (VLAs), or
  whether __STDC__ is defined.  This ports better to MSVC, which does
  not support VLAs and does not define __STDC__.
```


    Werner