ZIP reader: support LZMA_STREAM_END marker in 'lzma alone' files

ZIP reader: support LZMA_STREAM_END marker in 'lzma alone' files

It appears that ZIPX files with type 14 stream ('lzma alone') can
contain LZMA_STREAM_END markers at the end of the stream. The ZIP reader
was displaying an "unknown error 1" status after encountering such
marker.

The fix handles such case, and the reader doesn't return error status
anymore. Thus it should be possible to unpack files that contain the
LZMA_STREAM_END marker at the end of the stream.

Fixes #1257