Android library cannot be built using the ubuntu-22.04 image

[thunderbiscuit]

See this run for complete logs.

The error is related to the NDK version we are using (see issues #243 and #242 for why we need an older version of the NDK at the moment).

Logs:

   Compiling bdk v0.28.0
error: linking with `aarch64-linux-android21-clang` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/11.0.18-10/x64/bin:/home/runner/.local/bin:/opt/pipx_bin:/home/runner/.cargo/bin:/home/runner/.config/composer/vendor/bin:/usr/local/.ghcup/bin:/home/runner/.dotnet/tools:/snap/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/lib/android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin" VSLANG="1033" "aarch64-linux-android21-clang" "-Wl,--version-script=/tmp/rustcvAWt3N/list" "/tmp/rustcvAWt3N/symbols.o" 

...

 "/home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-linux-android/lib/libcompiler_builtins-3681d9e380a25a20.rlib" "-Wl,-Bdynamic" "-ldl" "-llog" "-lunwind" "-ldl" "-lm" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-L" "/home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-linux-android/lib" "-o" "/home/runner/work/bdk-ffi/bdk-ffi/target/aarch64-linux-android/release-smaller/deps/libbdkffi.so" "-Wl,--gc-sections" "-shared" "-Wl,-zrelro,-znow" "-Wl,--strip-all" "-nodefaultlibs"
  = note: /usr/local/lib/android/sdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld: cannot find -lunwind
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

[thunderbiscuit]

This was due to the upgrade to Rust 1.68 in the image, and so was causing the problem on ubuntu-20.04 as well.

See #348 and #345 for more info.

Likely related to this issue: cross-rs/cross#1222