add change statement: authorship, dates to LGPL v2.1 files

lib/mirror_buffer.h

@@ -10,6 +10,9 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
+ *
+ *=================================================================
+ * modified by fduncanh 2022
  */
 
 #ifndef MIRROR_BUFFER_H