website: update list of supported filesystems
|Reported by:||tidux||Owned by:||waddlesplash|
BtrFS has full xattr support and so should be explicitly called out as a usable filesystem for Linux cross compilation. Despite the infamous parity-RAID problems, it's perfectly fine on single disks or RAID 0/1/10 configurations. It's also the default root filesystem for openSuse and SLES/SLED.