test: clarify that `self_exe_symlink` fails on NetBSD due to bad F_GETPATH

closes https://codeberg.org/ziglang/zig/issues/30841
eb3f16db5eAlex Rønne Petersen committed on 1/21/2026, 3:42:17 PMparent9f33c33
1 file changedLine totals unavailable