dl/dlopen: add libs to wrapper LIBS

With this, libs (e.g., "-ldl") are not added to the wrapper LIBS
flags.  This may work on some platforms, but on at least RHEL 7.3, it
does not (i.e., compiling MPI applications fails because it can't find
dlopen).

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

opal/mca/dl/dlopen/configure.m4

@@ -1,6 +1,6 @@
 # -*- shell-script -*-
 #
-# Copyright (c) 2009-2015 Cisco Systems, Inc.  All rights reserved.
+# Copyright (c) 2009-2017 Cisco Systems, Inc.  All rights reserved
 #
 # $COPYRIGHT$
 #
@@ -47,7 +47,8 @@ AC_DEFUN([MCA_opal_dl_dlopen_CONFIG],[
           ])
 
     AS_IF([test "$opal_dl_dlopen_happy" = "yes"],
-          [opal_dl_dlopen_ADD_LIBS=$opal_dl_dlopen_LIBS
+          [dl_dlopen_ADD_LIBS=$opal_dl_dlopen_LIBS
+           dl_dlopen_WRAPPER_EXTRA_LIBS=$opal_dl_dlopen_LIBS
            $1],
           [$2])