gitlab-ci: Remove superfluous "dnf install" statement

The container already features meson and ninja, so there is no need
to try to install it with dnf again.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Message-Id: <20210730143809.717079-3-thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210806141015.2487502-4-alex.bennee@linaro.org>

.gitlab-ci.d/buildtest.yml

@@ -590,8 +590,6 @@ build-libvhost-user:
   image: $CI_REGISTRY_IMAGE/qemu/fedora:latest
   needs:
     job: amd64-fedora-container
-  before_script:
-    - dnf install -y meson ninja-build
   script:
     - mkdir subprojects/libvhost-user/build
     - cd subprojects/libvhost-user/build