net-mgmt/metronome: Revert "Fix build with clang-16.x"

This reverts commit 0ff8163865567ad705b0f465a00ba72c8fa6ba3e.

The underlying issue was correctly fixed by 2ba2bf91fc27.
This additional fix just breaks the build on FreeBSD 13.2.

See also: 2ba2bf91fc27fe173fe990f3711410087adecb50
Approved by: portmgr (build fix blanket)
MFH: 2023Q4