ci: need to install wget in order to download libdrm

Fixes: dcd171f5e9 ("gitlab-ci: More stable URL for kernel and ramdisk artifacts, for LAVA")
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5906>

.gitlab-ci/container/cross_build.sh

@@ -20,7 +20,8 @@ apt-get install -y --no-remove \
         libexpat1-dev:$arch \
         libffi-dev:$arch \
         libstdc++6:$arch \
-        libtinfo-dev:$arch
+        libtinfo-dev:$arch \
+        wget
 
 if [[ $arch == "armhf" ]]; then
         LLVM=llvm-7-dev