pseudo: Fix to work with glibc 2.34 systems

The merge of libdl into libc in glibc 2.34 causes problems for pseudo. Add a fix
that works around this issue.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit dd3e46a0)
Signed-off-by: Steve Sakoman <steve@sakoman.com>