On-device building

[t184256]

As dnshackresolver needs to be built with the Android NDK, (which isn't available on aarch64)

There might be no prebuilt toolchain, but one can try compiling it. I'll try something like:

crossSystem = {
  config = "aarch64-unknown-linux-android";
  sdkVer = "32";
  useAndroidPrebuilt = false;
  libc = "bionic";
  useLLVM = true;
};

Might be of use for inspiration: https://github.com/t184256/nix-compile-for-android

[t184256]

hm, on-device build crashed for some reason early in toolchain compilation

[ettom]

Getting rid of the prebuilt binaries would be great. The toolchain build would probably take a while though. Perhaps emulating x86 could be an option? 😄