examples: remove unused import in distributed jacobi

Author: lterrac

examples/distributed/jacobi3d/source/grid.cpp

@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-#include <mpi.h>
 #include <stdio.h>
 #include <math.h>
 #include "grid.hpp"
@@ -910,4 +909,4 @@ void Grid::print(const uint32_t it)
       printf("\n");
     }
   }
-}
+}