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Add support for parsing QCOW v3 header extensions to read the backing file format. The QCOW v3 spec allows optional header extensions between the fixed header and the backing file name. Implement read_header_extensions() to parse the extension area, which starts at the header_size offset. At the moment it is used to read the backing file format. Further extension processing is open in folow up implementations. Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>