[PATCH] Allow usage of archive .backup files as backup_label

Hi,

The .backup files written to the archive (if archiving is on) are very
similar to the backup_label that's written/returned by
pg_stop_backup()/pg_backup_stop(), they just have a few extra lines
about the end of backup process that are missing from backup_label.

The parser in xlogrecovery.c however barfs on them because it does not
expect the additional STOP WAL LOCATION on line 2.

The attached makes parsing this line optional, so that one can use those
.backup files in place of backup_label. This is e.g. useful if the
backup_label got lost or the output of pg_stop_backup() was not
captured.

Michael

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