libblkid: iso9660: Implement full High Sierra CDROM format support

libblkid: iso9660: Implement full High Sierra CDROM format support

Specification of High Sierra CDROM format was lost for a longer time, but
now was found again. So this change improves parsing High Sierra CDROM
images and implements everything which is already supported for ISO9660.

High Sierra and ISO9660 are very similar and there are only few differences
in headers. Most visible is that High Sierra has additional 8 bytes at
beginning of each descriptor with Volume Descriptor LBN value, it has more
locations of path table occurrences in Volume descriptor, has shorten
copyright and abstract file ids, bibliographic file id is missing, standard
version is 0 and it does not have timezone offset field in date structure.
Thus positions of some fields are different between High Sierra and ISO9960.

Code in iso9660.c is adjusted to handle both formats, instead implementing
two very similar parsers.

CDROM image of Microsoft Programmers Library 1.0 (MSPL10) from 1988, which
is in High Sierra format, was before this change parsed as:

ID_FS_BLOCK_SIZE=2048
ID_FS_VERSION=High\x20Sierra
ID_FS_LABEL=MS_PL_VERSION_100
ID_FS_LABEL_ENC=MS_PL_VERSION_100
ID_FS_TYPE=iso9660
ID_FS_USAGE=filesystem

And after this change as:

ID_FS_FSBLOCKSIZE=2048
ID_FS_BLOCK_SIZE=2048
ID_FS_FSSIZE=542998528
ID_FS_PUBLISHER_ID=MICROSOFTCORPORATION16011NE36THWAYREDMONDWA98073
ID_FS_DATA_PREPARER_ID=MERIDIAN_DATA_CD_PUBLISHER
ID_FS_APPLICATION_ID=PL
ID_FS_UUID=1988-07-12-00-37-37-00
ID_FS_UUID_ENC=1988-07-12-00-37-37-00
ID_FS_VERSION=High\x20Sierra
ID_FS_LABEL=MS_PL_VERSION_100
ID_FS_LABEL_ENC=MS_PL_VERSION_100
ID_FS_TYPE=iso9660
ID_FS_USAGE=filesystem

Scan of original hardcopy High Sierra specification:
https://www.os2museum.com/files/docs/cdrom/CDROM_Working_Paper-1986.pdf

HTML version of High Sierra specification:
https://www.os2museum.com/files/docs/cdrom/hsg_wp.html

Archived hardcopy of High Sierra specification:
https://archive.org/details/cdrom-working-paper-1986

Story behind Looking for High Sierra:
https://www.os2museum.com/wp/looking-for-high-sierra/