[bug-cppi] bug#63172: [PATCH cppi] build: avoid a compiler warning about _FORTIFY_SOURCE redefinition

[Jim Meyering]

On Sat, Apr 29, 2023 at 10:10 AM Dmitry V. Levin <ldv@altlinux.org> wrote:
> When compiler provides its own definition of _FORTIFY_SOURCE, it complains
> about _FORTIFY_SOURCE being redefined:
>
> ./lib/config.h:35: error: "_FORTIFY_SOURCE" redefined [-Werror]
>    35 |    # define _FORTIFY_SOURCE 2
>       |
> <built-in>: note: this is the location of the previous definition
>
> * configure.ac (FORTIFY_SOURCE): Do not redefine _FORTIFY_SOURCE.

Thank you. Pushed, along with a few other changes.