liblogging: update project URL

The original site www.liblogging.org has been taken down because of the
new European data protection regulation (GDPR), to which it was not
compliant.

Signed-off-by: Carlos Santos <casantos@datacom.com.br>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/liblogging/Config.in

@@ -5,4 +5,4 @@ config BR2_PACKAGE_LIBLOGGING
 	  logging. It offers an enhanced replacement
 	  for the syslog() call, but retains its ease of use.
 
-	  http://www.liblogging.org/
+	  https://www.rsyslog.com/liblogging/