depends: Avoid warning: "_FORTIFY_SOURCE" redefined for libevent #32266

1. 
   hebasto commented at 3:23 pm on April 14, 2025: member

   On Alpine Linux 3.12.3, compiling the libevent package produces multiple warnings:

   0$ gmake -C depends -j $(nproc) libevent
   1<snip>
   2<command-line>: warning: "_FORTIFY_SOURCE" redefined
   3<built-in>: note: this is the location of the previous definition
   4<snip>
   

   This PR fixes these warnings.

2. depends: Avoid `warning: "_FORTIFY_SOURCE" redefined` for `libevent`

   On Alpine Linux 3.12.3, compiling the `libevent` package produces
   multiple warnings:
   ```
   $ gmake -C depends -j $(nproc) libevent
   <snip>
   <command-line>: warning: "_FORTIFY_SOURCE" redefined
   <built-in>: note: this is the location of the previous definition
   <snip>
   ```

   fe71a4b139
3. hebasto added the label Build system on Apr 14, 2025
4. 
   DrahtBot commented at 3:23 pm on April 14, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32266.

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   Type	Reviewers
   ACK	shahsb

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5. 
   shahsb commented at 4:59 am on April 16, 2025: none

   concept ACK
6. 
   shahsb commented at 5:06 am on April 16, 2025: none

   ACK https://github.com/bitcoin/bitcoin/pull/32266/commits/fe71a4b139f3a142468c2e931775813bc8f9d2ad
7. maflcko added the label DrahtBot Guix build requested on Apr 16, 2025

Contributors
hebasto DrahtBot shahsb

Labels
Build system DrahtBot Guix build requested