test: remove standalone sigpipe test

This should be restored, but there's no point keeping disabled code that's just
going to bitrot.

https://github.com/ziglang/zig/issues/25466
3539cad176Alex Rønne Petersen committed on 10/4/2025, 6:53:19 PMparentd9cd4d0
3 files changedLine totals unavailable