Fix build and tests issues on OpenBSD 6.4+

1)  lutimes doesn't exist on OpenBSD so it needs to be under conditional
    compilation.

    The only "reference" that I could find related to this is the discussion
    here: https://github.com/rust-lang/libc/pull/790 .

2)  fexecve doesn't exist on OpenBSD so add conditional compilation for it
    in unistd and in related tests.

    The only "reference" that I could find is a mention that fexecve is
    not implemented on OpenBSD in the manual pages for signal(3) and
    sigaction(2):

    Official repository (search for "fexecve"):
    https://cvsweb.openbsd.org/src/lib/libc/sys/sigaction.2?rev=1.75&content-type=text/x-cvsweb-markup

    Github mirror:
    https://github.com/openbsd/src/blob/master/lib/libc/sys/sigaction.2#L619

3)  AIO doesn't work on OpenBSD so put test_aio_drop under conditional
    compilation.

4)  Add relevant changelog entries.

P.S. On OpenBSD remains the issue of test_scm_rights which builds
correctly but fails at runtime.

1 files changed, 14 insertions, 1 deletions

diff --git a/test/test_stat.rs b/test/test_stat.rs
index 9d27ce79..fae8df82 100644
--- a/test/test_stat.rs
+++ b/test/test_stat.rs
@@ -7,7 +7,14 @@ use std::time::{Duration, UNIX_EPOCH};
 use libc::{S_IFMT, S_IFLNK};
 
 use nix::fcntl;
-use nix::sys::stat::{self, fchmod, fchmodat, futimens, lutimes, stat, utimes, utimensat};
+use nix::sys::stat::{self, fchmod, fchmodat, futimens, stat, utimes, utimensat};
+#[cfg(any(target_os = "linux",
+          target_os = "haiku",
+          target_os = "ios",
+          target_os = "macos",
+          target_os = "freebsd",
+          target_os = "netbsd"))]
+use nix::sys::stat::lutimes;
 use nix::sys::stat::{Mode, FchmodatFlags, UtimensatFlags};
 
 #[cfg(not(any(target_os = "netbsd")))]
@@ -196,6 +203,12 @@ fn test_utimes() {
 }
 
 #[test]
+#[cfg(any(target_os = "linux",
+          target_os = "haiku",
+          target_os = "ios",
+          target_os = "macos",
+          target_os = "freebsd",
+          target_os = "netbsd"))]
 fn test_lutimes() {
     let tempdir = tempfile::tempdir().unwrap();
     let target = tempdir.path().join("target");