Add a .h dependency in order to remove a warning when we compile without --enable-debug.

This commit was SVN r10646.

ompi/mca/mtl/base/mtl_base_component.c

@@ -20,6 +20,7 @@
 
 #include "opal/mca/mca.h"
 #include "opal/mca/base/base.h"
+#include "opal/util/output.h"
 #include "ompi/constants.h"
 #include "ompi/mca/mtl/mtl.h"
 #include "ompi/mca/mtl/base/base.h"