Make syncmail compatible with FreeBSD

bin/.bin/syncmail.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-notmuch search --output=files tag:deleted | xargs -0 rm
+notmuch search --output=files tag:deleted | xargs -r rm
 notmuch new
 muchsync rhea.unbl.ink
 exit 0