Change test per recommendation of @jsquyres

Signed-off-by: Ralph Castain <rhc@open-mpi.org>

opal/mca/pmix/pmix2x/configure.m4

@@ -56,7 +56,7 @@ AC_DEFUN([MCA_opal_pmix_pmix2x_CONFIG],[
           [opal_pmix_pmix2x_args="--disable-debug $opal_pmix_pmix2x_args"
            CFLAGS="$OPAL_CFLAGS_BEFORE_PICKY $OPAL_VISIBILITY_CFLAGS"])
     AS_IF([test "$with_devel_headers" = "yes"],
-          [AS_IF([test "$enable_dlopen" = "yes"],
+          [AS_IF([test "$enable_dlopen" != "no"],
                  [opal_pmix_pmix2x_args="--with-pmix-extra-lib=$OPAL_TOP_BUILDDIR/opal/lib${OPAL_LIB_PREFIX}open-pal.la $opal_pmix_pmix2x_args"])
            opal_pmix_pmix2x_args="--with-devel-headers  $opal_pmix_pmix2x_args"])
     CPPFLAGS="-I$OPAL_TOP_SRCDIR -I$OPAL_TOP_BUILDDIR -I$OPAL_TOP_SRCDIR/opal/include -I$OPAL_TOP_BUILDDIR/opal/include $CPPFLAGS"