Convert "install_deps" if-chain to a case statement

ci/install_deps.sh

@@ -9,26 +9,17 @@ DEPS=(
   hardening-includes gnupg
 )
 
-if [[ -z "${ARCH_SUFFIX-}" ]] || [[ "$ARCH_SUFFIX" = "amd64" ]]; then
-  true
-elif [[ "$ARCH_SUFFIX" = "armel" ]]; then
-  DEPS+=(gcc-arm-linux-gnueabi binutils-arm-linux-gnueabi libc6-dev-armel-cross)
-elif [[ "$ARCH_SUFFIX" = "armhf" ]]; then
-  DEPS+=(gcc-arm-linux-gnueabihf binutils-arm-linux-gnueabihf libc6-dev-armhf-cross)
-elif [[ "$ARCH_SUFFIX" = "arm64" ]]; then
-  DEPS+=(gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu libc6-dev-arm64-cross)
-elif [[ "$ARCH_SUFFIX" = "ppc64el" ]]; then
-  DEPS+=(gcc-powerpc64le-linux-gnu binutils-powerpc64le-linux-gnu libc6-dev-ppc64el-cross)
-elif [[ "$ARCH_SUFFIX" = "s390x" ]]; then
-  DEPS+=(gcc-s390x-linux-gnu binutils-s390x-linux-gnu libc6-dev-s390x-cross)
-elif [[ "$ARCH_SUFFIX" = "i386" ]]; then
-  DEPS+=(libc6-dev-i386  gcc-multilib)
-elif [[ "$ARCH_SUFFIX" = "muslc-amd64" ]]; then
-  DEPS+=(musl-tools)
-else
-  echo "Unknown ARCH_SUFFIX=${ARCH_SUFFIX}"
-  exit 1
-fi
+case "${ARCH_SUFFIX-}" in
+  amd64|'') ;;
+  arm64) DEPS+=(gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu libc6-dev-arm64-cross) ;;
+  armel) DEPS+=(gcc-arm-linux-gnueabi binutils-arm-linux-gnueabi libc6-dev-armel-cross) ;;
+  armhf) DEPS+=(gcc-arm-linux-gnueabihf binutils-arm-linux-gnueabihf libc6-dev-armhf-cross) ;;
+  i386) DEPS+=(libc6-dev-i386  gcc-multilib) ;;
+  muslc-amd64) DEPS+=(musl-tools) ;;
+  ppc64el) DEPS+=(gcc-powerpc64le-linux-gnu binutils-powerpc64le-linux-gnu libc6-dev-ppc64el-cross) ;;
+  s390x) DEPS+=(gcc-s390x-linux-gnu binutils-s390x-linux-gnu libc6-dev-s390x-cross) ;;
+  *) echo "Unknown ARCH_SUFFIX=${ARCH_SUFFIX-}"; exit 1 ;;
+esac
 
 apt-get update
 apt-get install --no-install-recommends --yes "${DEPS[@]}"