Extended header 64 bit file size

[polluks]

#define LHA_EXT_HEADER_64BIT_FILESIZE 0x42
https://github.com/sodero/lha/blob/263f075d17e11ee2e02193c81e28f6073bbd48f4/src/header.c#L658

[fragglet]

ok?

[roytam1]

#define LHA_EXT_HEADER_64BIT_FILESIZE 0x42
https://github.com/sodero/lha/blob/263f075d17e11ee2e02193c81e28f6073bbd48f4/src/header.c#L658

better pointing to specified rev: sodero/lha@609c119