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Currently, builds of libevent in depends, using CMake, fail on some systems, like Alpine, with the following: ```bash /bitcoin/depends/work/build/aarch64-unknown-linux-musl/libevent/2.1.12-stable-1516ed47ea8/evmap.c: In function 'evmap_signal_add_': /bitcoin/depends/work/build/aarch64-unknown-linux-musl/libevent/2.1.12-stable-1516ed47ea8/evmap.c:456:31: error: 'NSIG' undeclared (first use in this function) 456 | if (sig < 0 || sig >= NSIG) ``` From what I can tell the `_GNU_SOURCE` "detection" in libevents CMake build system, never? really worked, and it's not clear what a nice fix is. For now, always use `_GNU_SOURCE` when building libevent in depends. Github-Pull: #30743 Rebased-From: 556775408797d8e27154c3edaf139820b0979cce