[PATCH cygport] Increase _FORTIFY_SOURCE level from 2 to 3 in CFLAGS

[Jon Turney]

On 02/02/2024 16:13, Christian Franke via Cygwin-apps wrote:
> _FORTIFY_SOURCE=3 is supported by Cygwin 3.5.0 headers and Cygwin gcc 
> 13.2.1 test release.
> 
> Silently falls back to level 2 if level 3 is unsupported (older headers 
> or gcc) or to level 0 if unsupported at all (C++, clang).

Thanks. I applied this.

I'm thinking I want to try to do another cygport release fairly soonish, 
so please feel free to remind me about any other patches by you (or 
others) which I need to look at before then.