Mariabackup: Make some globals static

extra/mariabackup/backup_copy.cc

@@ -1205,6 +1205,7 @@ copy_or_move_file(const char *src_file_path,
 
 
 
+static
 bool
 backup_files(const char *from, bool prep_mode)
 {

extra/mariabackup/xtrabackup.cc

@@ -202,9 +202,9 @@ my_bool opt_ssl_verify_server_cert;
 /* === metadata of backup === */
 #define XTRABACKUP_METADATA_FILENAME "xtrabackup_checkpoints"
 char metadata_type[30] = ""; /*[full-backuped|log-applied|incremental]*/
-lsn_t metadata_from_lsn;
+static lsn_t metadata_from_lsn;
 lsn_t metadata_to_lsn;
-lsn_t metadata_last_lsn;
+static lsn_t metadata_last_lsn;
 
 static ds_file_t*	dst_log_file;
 

extra/mariabackup/xtrabackup.h

@@ -56,9 +56,7 @@ extern xb_page_bitmap *changed_page_bitmap;
 extern char		*xtrabackup_incremental;
 extern my_bool		xtrabackup_incremental_force_scan;
 
-extern lsn_t		metadata_from_lsn;
 extern lsn_t		metadata_to_lsn;
-extern lsn_t		metadata_last_lsn;
 
 extern xb_stream_fmt_t	xtrabackup_stream_fmt;
 extern ibool		xtrabackup_stream;