Merge pull request #3983 from semarie/openbsd-fnmatch

unbreak OpenBSD after #3937

Author: tgross35

src/unix/mod.rs

@@ -329,6 +329,7 @@ cfg_if! {
         target_os = "macos",
         target_os = "freebsd",
         target_os = "android",
+        target_os = "openbsd",
     ))] {
         pub const FNM_PATHNAME: c_int = 1 << 1;
         pub const FNM_NOESCAPE: c_int = 1 << 0;