ci/debian: arm64: only install Meson once

We already use `install-meson.sh` so that we can select an appropriate
version of Meson. Instead of installing two copies just do it before
we begin building anything in the container.

Signed-off-by: Matt Jolly <kangie@gentoo.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33725>

.gitlab-ci/container/debian/arm64_build.sh

@@ -71,7 +71,6 @@ DEPS=(
     libwayland-egl-backend-dev
     "llvm-${LLVM_VERSION}-dev"
     ninja-build
-    meson
     openssh-server
     pkgconf
     python3-mako
@@ -98,7 +97,10 @@ pip3 install --break-system-packages "ci-fairy[s3] @ git+https://gitlab.freedesk
 
 pip3 install --break-system-packages -r bin/ci/test/requirements.txt
 
+. .gitlab-ci/container/install-meson.sh
+
 arch=armhf
+
 . .gitlab-ci/container/cross_build.sh
 
 . .gitlab-ci/container/container_pre_build.sh
@@ -111,8 +113,6 @@ arch=armhf
 
 . .gitlab-ci/container/build-libclc.sh
 
-. .gitlab-ci/container/install-meson.sh
-
 . .gitlab-ci/container/build-rust.sh
 
 . .gitlab-ci/container/build-bindgen.sh