A GPT-only partition table prevents BIOS booting on some systems that do not support BIOS/GPT

Some systems that do not support BIOS/GPT booting cannot boot the ISO in BIOS mode since !80 (merged).

See https://bbs.archlinux.org/viewtopic.php?id=264096 .

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The solution seems to be to partially undo the changes of !80 (merged) and use the xorrisofs option -isohybrid-gpt-basdat. I say partially, because it's still possible to keep the El Torito UEFI image as a separate partition.

Although combining the -isohybrid-gpt-basdat and -append_partition is rare, to say the least, it appears to work.

changed milestone to %v53

mentioned in merge request !160 (merged)

Thanks to the help of Thomas Schmitt (scdbackup), jaworek3211 and Nio Wiklund (sudodus), there is now a fix for this in !160 (merged).

closed with merge request !160 (merged)

closed with commit 09b6127f