FreeBSD: skip checking of xktls_session* structs on FreeBSD 14.x and older

Author: kostikbel

libc-test/build.rs

@@ -2910,6 +2910,13 @@ fn test_freebsd(target: &str) {
             // Those are introduced in FreeBSD 14.1.
             "kcmp" => true,
 
+            // Those are introduced in FreeBSD 15.
+            "xktls_session_onedir" | "xktls_session"
+                if Some(15) > freebsd_ver =>
+            {
+                true
+            }
+
             _ => false,
         }
     });