Move initialization of zipper/zip point inside ifdef.

src/drivers/las/Writer.cpp

@@ -454,10 +454,10 @@ void Writer::fillHeader(PointContextRef ctx)
 
 void Writer::readyCompression()
 {
+#ifdef PDAL_HAVE_LASZIP
     m_zipPoint.reset(new ZipPoint(m_lasHeader.pointFormat(),
         m_lasHeader.pointLen()));
     m_zipper.reset(new LASzipper());
-#ifdef PDAL_HAVE_LASZIP
     // Note: this will make the VLR count in the header incorrect, but we
     // rewrite that bit in done() to fix it up.
     std::vector<uint8_t> data = m_zipPoint->vlrData();