pyliblzma installs 'lzma' module that is incompatible with the same-named module of Python 3.3+. As a result, it randomly wreaks havoc in programs not written to account for its existence and it will never support Python 3. Besides, it's dead. FWICS it only applies to an old version, so please close it when that version is removed. Also, please finally clean up old versions.
With old Python 2 versions of this package having been dropped, it doesn't depend on dev-python/pyliblzma any more.