add config options to choose mariadb binaries alternatively

Author: internethering

automysqlbackup

@@ -57,6 +57,7 @@ let "N_backup_local_nofiles=0x20"
 load_default_config() {
   CONFIG_mysql="/usr/bin/mysql"
   CONFIG_mysql_dump="/usr/bin/mysqldump"
+  CONFIG_mysql_show="/usr/bin/mysqlshow"
   CONFIG_configfile="/etc/automysqlbackup/automysqlbackup.conf"
   CONFIG_backup_dir='/var/backup/db'
   CONFIG_multicore='yes'