The upstream pjd/pjdfstest uses hardcoded ~768-byte filenames which
exceed the Linux FUSE kernel NAME_MAX=255 limit. The sanwan fork
(used by JuiceFS) uses pathconf(_PC_NAME_MAX) to dynamically
determine the filesystem's actual NAME_MAX and generates test names
accordingly.
This removes all 26 NAME_MAX-related entries from known_failures.txt,
reducing the skip list from 31 to 5 entries.