Potential workaround for poor zstd performance

Performance is still not great, but better

internal/decompress/lzma.go

@@ -12,3 +12,7 @@ func (l Lzma) Reader(r io.Reader) (io.ReadCloser, error) {
 	rdr, err := lzma.NewReader(r)
 	return io.NopCloser(rdr), err
 }
+
+func (l Lzma) Resetable() bool { return false }
+
+func (l Lzma) Reset(old, src io.Reader) error { return ErrNotResetable }