Add missing include

This commit was SVN r28114.

opal/mca/db/base/db_base_select.c

@@ -15,6 +15,7 @@
 #include "opal/mca/mca.h"
 #include "opal/mca/base/base.h"
 #include "opal/mca/base/mca_base_component_repository.h"
+#include "opal/util/output.h"
 
 #include "opal/mca/db/base/base.h"