fix build with gcc-15

[heitbaum]

PLEASE NOTE the following text from the iperf3 license. Submitting a pull request to the iperf3 repository constitutes "[making] Enhancements available...publicly":

You are under no obligation whatsoever to provide any bug fixes, patches, or
upgrades to the features, functionality or performance of the source code
("Enhancements") to anyone; however, if you choose to make your Enhancements
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Enhancements, then you hereby grant the following license: a non-exclusive,
royalty-free perpetual license to install, use, modify, prepare derivative
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such enhancements or derivative works thereof, in binary and source code form.

The complete iperf3 license is available in the LICENSE file in the top directory of the iperf3 source tree.

• Version of iperf3 (or development branch, such as master or 3.1-STABLE) to which this pull request applies: master and 3.17.1

• Issues fixed (if any): compile with gcc-15

• Brief description of code changes (suitable for use as a commit message): update declarations to include types as required by gcc-15 and -std=c23

[bmah888]

Thanks for the PR, we'll take a look!

[userdocs]

I can test it.

current master will fail with gcc 15 https://github.com/userdocs/iperf3-static-test/actions/runs/14755488675

This patch branch does not - https://github.com/userdocs/iperf3-static-test/actions/runs/14755738953/job/41423407651

[userdocs]

@bmah888

https://sources.debian.org/patches/iperf3/3.18-2/02-gcc15.patch/

[bmah888]

@bmah888

https://sources.debian.org/patches/iperf3/3.18-2/02-gcc15.patch/

Perfect, thanks the help @userdocs!

[userdocs]

Just to confirm it built fine on master with gcc15

https://github.com/userdocs/iperf3-static-test/actions/runs/14802833500

[bmah888]

@userdocs Thanks for the confirmation!

[heitbaum]

Thanks for the PR @heitbaum , or should I call you Mr. Bump? :-)

heitbaum is fine :-) as the LE distro packing lead, the team thought Mr.Bump suited, so the emoji stuck :-)