std: disable flaky os.fcntl test

See tracking issue #11074

lib/std/os/test.zig

@@ -834,6 +834,11 @@ test "writev longer than IOV_MAX" {
 test "POSIX file locking with fcntl" {
     if (native_os == .windows or native_os == .wasi) return error.SkipZigTest;
 
+    if (native_os == .linux and builtin.cpu.arch == .aarch64) {
+        // https://github.com/ziglang/zig/issues/11074
+        return error.SkipZigTest;
+    }
+
     var tmp = std.testing.tmpDir(.{});
     defer tmp.cleanup();