Install optional dependencies of QEMU to get better coverage.

The following components are now enabled:

  $ ./configure
  ...
  Multipath support yes
  VNC SASL support  yes
  RDMA support      yes
  PVRDMA support    yes
  libiscsi support  yes
  seccomp support   yes
  libpmem support   yes
  libudev           yes

Note: The udev-devel package is provided by systemd-devel.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190504055440.20406-1-philmd@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Marcel <Apfelbaum&lt;marcel.apfelbaum@gmail.com>