Vectorized weights and covariance transfers in points::pca methods

Signed-off-by: Nick Avramoussis <4256455+Idclip@users.noreply.github.com>

Author: Idclip

openvdb/openvdb/points/PrincipalComponentAnalysis.h

@@ -24,6 +24,7 @@
 #include <openvdb/thread/Threading.h>
 #include <openvdb/util/NullInterrupter.h>
 #include <openvdb/util/Assert.h>
+#include <openvdb/simd/Simd.h>
 #include <openvdb/points/PointAttribute.h>
 #include <openvdb/points/PointGroup.h>
 #include <openvdb/points/PointTransfer.h>