ci: drop dead script since e722ba9f67

Noticed-by: Michel Daenzer <michel@daenzer.net>

.gitlab-ci/debian-install.sh

@@ -1,71 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit
-set -o xtrace
-
-export DEBIAN_FRONTEND=noninteractive
-
-CROSS_ARCHITECTURES=(i386 armhf arm64 ppc64el)
-for arch in ${CROSS_ARCHITECTURES[@]}; do
-  dpkg --add-architecture $arch
-done
-
-apt-get install -y \
-  ca-certificates
-
-sed -i -e 's/http:\/\/deb/https:\/\/deb/g' /etc/apt/sources.list
-echo 'deb https://deb.debian.org/debian buster-backports main' >/etc/apt/sources.list.d/backports.list
-
-apt-get update
-
-# Use newer packages from backports by default
-cat >/etc/apt/preferences <<EOF
-Package: *
-Pin: release a=buster-backports
-Pin-Priority: 500
-EOF
-
-apt-get dist-upgrade -y
-
-EPHEMERAL="
-  meson \
-  "
-
-apt-get install -y --no-remove \
-  $EPHEMERAL \
-  build-essential \
-  docbook-xsl \
-  libatomic-ops-dev \
-  libcairo2-dev \
-  libcunit1-dev \
-  libpciaccess-dev \
-  ninja-build \
-  pkg-config \
-  python3 \
-  python3-pip \
-  python3-wheel \
-  python3-setuptools \
-  python3-docutils \
-  valgrind
-
-for arch in ${CROSS_ARCHITECTURES[@]}; do
-  cross_file=/cross_file-$arch.txt
-
-  # Cross-build libdrm deps
-  apt-get install -y --no-remove \
-    libcairo2-dev:$arch \
-    libpciaccess-dev:$arch \
-    crossbuild-essential-$arch
-
-  # Generate cross build files for Meson
-  /usr/share/meson/debcrossgen --arch $arch -o $cross_file
-
-  # Work around a bug in debcrossgen that should be fixed in the next release
-  if [ $arch = i386 ]; then
-    sed -i "s|cpu_family = 'i686'|cpu_family = 'x86'|g" $cross_file
-  fi
-done
-
-apt-get purge -y $EPHEMERAL
-
-# Test that the oldest Meson version we claim to support is still supported
-pip3 install meson==0.53