Change installation of dependencies for Aarch64 Dockerfile

Author: Kobzol

ci/docker/aarch64-unknown-linux-gnu/Dockerfile

@@ -1,8 +1 @@
 FROM rust-aarch64-unknown-linux-gnu
-
-# Building `aws-lc-rs` for Linux depends on `gcc-multilib`, `libclang` and `bindgen`.
-# See: https://aws.github.io/aws-lc-rs/requirements/linux
-RUN apt-get update && apt-get install -qy gcc-multilib libclang-dev
-
-ENV CC_aarch64_unknown_linux_gnu=aarch64-unknown-linux-gnu-gcc \
-    CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-unknown-linux-gnu-gcc