chore: import upstream snapshot with attribution

apache/save_sync.cgi

@@ -0,0 +1,18 @@
+#!/usr/local/bin/perl
+# save_sync.cgi
+# Save user synchronisation options
+
+require './apache-lib.pl';
+require './auth-lib.pl';
+&ReadParse();
+&allowed_auth_file($in{'file'}) || &error(&text('authu_ecannot', $in{'file'}));
+$in{'sync'} =~ s/\0/ /g;
+if ($in{'sync'}) {
+	$config{"sync_$in{'file'}"} = $in{'sync'};
+	}
+else {
+	delete($config{"sync_$in{'file'}"});
+	}
+&write_file("$module_config_directory/config", \%config);
+&redirect("list_authusers.cgi?file=$in{'file'}&url=".&urlize($in{'url'}));
+