Add support for dumping CD First Track Pregap in FreeBSD.

[claunia]

Description

DiscImageChef should try to read CompactDisc first track pregap.

Exact command line used:

DiscImageChef dump-media -i /dev/cd0

Expected behavior:

DiscImageChef tries to read CompactDisc first track pregap.

Actual behavior:

First track pregap reading is not tried per aaru-dps/Aaru@ad5847e because of upstream bug #224253