Cleanup - remove unused variables and functions after MDEV-18917

extra/mariabackup/backup_mysql.cc

@@ -333,7 +333,6 @@ get_mysql_vars(MYSQL *connection)
 	char *version_comment_var = NULL;
 	char *innodb_version_var = NULL;
 	char *have_backup_locks_var = NULL;
-	char *have_backup_safe_binlog_info_var = NULL;
 	char *log_bin_var = NULL;
 	char *lock_wait_timeout_var= NULL;
 	char *wsrep_on_var = NULL;

extra/mariabackup/xtrabackup.cc

@@ -1861,7 +1861,6 @@ xtrabackup_read_metadata(char *filename)
 {
 	FILE	*fp;
 	my_bool	 r = TRUE;
-	int	 t;
 
 	fp = fopen(filename,"r");
 	if(!fp) {
@@ -5792,35 +5791,6 @@ innodb_free_param()
 	free_tmpdir(&mysql_tmpdir_list);
 }
 
-
-/**************************************************************************
-Store the current binary log coordinates in a specified file.
-@return 'false' on error. */
-static bool
-store_binlog_info(
-/*==============*/
-	const char *filename)	/*!< in: output file name */
-{
-	FILE *fp;
-
-	if (trx_sys_mysql_bin_log_name[0] == '\0') {
-		return(true);
-	}
-
-	fp = fopen(filename, "w");
-
-	if (!fp) {
-		msg("mariabackup: failed to open '%s'\n", filename);
-		return(false);
-	}
-
-	fprintf(fp, "%s\t" UINT64PF "\n",
-		trx_sys_mysql_bin_log_name, trx_sys_mysql_bin_log_pos);
-	fclose(fp);
-
-	return(true);
-}
-
 static void
 xtrabackup_prepare_func(int argc, char ** argv)
 {