Remove unnecessary include of Eigen/src header (#641)

We're already `#include`-ing `Eigen/Core` so it is unnecessary to also
include `Eigen/src/Core/util/Meta.h`.

Including things from `Eigen/src` causes an error in build systems like
Bazel which have strict inclusion checking of a dependency's public
headers.

Author: boscosiu

ouster_client/src/image_processing.cpp

@@ -5,8 +5,6 @@
 
 #include "ouster/image_processing.h"
 
-#include <Eigen/src/Core/util/Meta.h>
-
 #include <Eigen/Core>
 #include <Eigen/LU>
 #include <algorithm>