MDEV-18575 Cleanup : remove innodb-encrypt-log parameter from mariabackup

extra/mariabackup/xtrabackup.cc

@@ -566,7 +566,6 @@ enum options_xtrabackup
   OPT_XTRA_INCREMENTAL_FORCE_SCAN,
   OPT_DEFAULTS_GROUP,
   OPT_PLUGIN_LOAD,
-  OPT_INNODB_ENCRYPT_LOG,
   OPT_CLOSE_FILES,
   OPT_CORE_FILE,
 
@@ -1159,10 +1158,6 @@ Disable with --skip-innodb-doublewrite.", (G_PTR*) &innobase_use_doublewrite,
   &xb_plugin_load, &xb_plugin_load,
   0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0 },
 
-  { "innodb-encrypt-log", OPT_INNODB_ENCRYPT_LOG, "encrypton plugin to load",
-  &srv_encrypt_log, &srv_encrypt_log,
-  0, GET_BOOL, REQUIRED_ARG, 0, 0, 0, 0, 0, 0 },
-  
   {"open_files_limit", OPT_OPEN_FILES_LIMIT, "the maximum number of file "
    "descriptors to reserve with setrlimit().",
    (G_PTR*) &xb_open_files_limit, (G_PTR*) &xb_open_files_limit, 0, GET_ULONG,