Fix the compilation of the MPI lib

mpi/starpu_mpi_private.h

@@ -22,6 +22,7 @@
 #include "starpu_mpi.h"
 #include "starpu_mpi_fxt.h"
 #include <common/list.h>
+#include <common/utils.h>
 #include <pthread.h>
 
 #define SEND_REQ	0