Add aarch64-linux-android target

This allows cargo to build for android. A new
dev container is built to include this.

To allow us to build the new container, we had to
remove the ffmpeg dependencies for armhf which fail
to install in the current version of debian.

BUG=b:349907813
TEST=dev_container presubmit clippy_android

Change-Id: I7fbcd460e53fbd339a28b451a91b0722d34257b8
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5689659
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Commit-Queue: Dennis Kempin <denniskempin@google.com>

media/ffmpeg/build.rs

@@ -17,6 +17,11 @@ fn main() {
         return;
     }
 
+    // ffmgeg is not supported by CI on 32-bit arm
+    if std::env::var("CARGO_CFG_TARGET_ARCH").unwrap() == "arm" {
+        return;
+    }
+
     // Match all ffmpeg 6.0+ versions.
     Config::new()
         .atleast_version("60")

media/ffmpeg/src/lib.rs

@@ -2,7 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#![cfg(any(target_os = "android", target_os = "linux"))]
+#![cfg(all(
+    any(target_os = "android", target_os = "linux"),
+    not(target_arch = "arm")
+))]
 
 pub mod avcodec;
 mod avutil;

tools/impl/dev_container/version

@@ -1 +1 @@
-r0046
+r0047

tools/install-armhf-deps

@@ -6,16 +6,12 @@ set -ex
 
 sudo apt-get install --yes --no-install-recommends \
     gcc-arm-linux-gnueabihf \
-    libavcodec-dev:armhf \
-    libavutil-dev:armhf \
     libc-dev:armhf \
     libcap-dev:armhf \
     libdbus-1-dev:armhf \
     libdrm-dev:armhf \
     libepoxy-dev:armhf \
     libssl-dev:armhf \
-    libswscale-dev:armhf \
-    libva-dev:armhf \
     libwayland-dev:armhf \
     libxext-dev:armhf
 

tools/install-deps

@@ -79,6 +79,9 @@ rustup component add llvm-tools-preview
 # Allow cross-compilation via mingw64
 rustup target add x86_64-pc-windows-gnu
 
+# Allow cross-compilation for android
+rustup target add aarch64-linux-android
+
 # Install nightly toolchain. Only used for rustfmt
 rustup toolchain install nightly --profile minimal --component rustfmt