Sigh, namespacing of xattr works differently on *BSD.

Tested on FreeBSD.

src/duplicacy_utils_linux.go

@@ -0,0 +1,10 @@
+// Copyright (c) Acrosync LLC. All rights reserved.
+// Free for personal use and commercial trial
+// Commercial use requires per-user licenses available from https://duplicacy.com
+
+package duplicacy
+
+func excludedByAttribute(attributes map[string][]byte) bool {
+	_, ok := attributes["user.duplicacy_exclude"]
+	return ok
+}