gitlab-ci.yml: Use libvdeplug-dev to compile-test the VDE network backend

The libvdeplug-dev package is required to compile-test net/vde.c.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <20191016131002.29663-1-thuth@redhat.com>
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>

.gitlab-ci.yml

@@ -5,7 +5,7 @@ before_script:
 build-system1:
  script:
  - apt-get install -y -qq libgtk-3-dev libvte-dev nettle-dev libcacard-dev
-      libusb-dev libvde-dev libspice-protocol-dev libgl1-mesa-dev
+      libusb-dev libvde-dev libspice-protocol-dev libgl1-mesa-dev libvdeplug-dev
  - ./configure --enable-werror --target-list="aarch64-softmmu alpha-softmmu
       cris-softmmu hppa-softmmu lm32-softmmu moxie-softmmu microblazeel-softmmu
       mips64el-softmmu m68k-softmmu ppc-softmmu riscv64-softmmu sparc-softmmu"