Before I was getting
```
error: attribute 'targetPlatforms' missing
at /nix/store/dyzl40h25l04565n90psbhzgnc5vp2xr-source/pkgs/build-support/rust/build-rust-package/default.nix:162:7:
161| meta.platforms or lib.platforms.all
162| rustc.targetPlatforms;
| ^
163| };
```
This was probably an upstream issues as discussed in here
https://discourse.nixos.org/t/error-attribute-targetplatforms-missing-after-updating-inputs/54494
After this update it is fixed.
Delta Chat for Android does not support Android 4 anymore,
so there is no reason to keep using unsupported NDK.
r27 is the latest LTS version of Android NDK.
Tested:
- `nix build .#deltachat-rpc-server-arm64-v8a-android`
- `nix build .#deltachat-rpc-server-armv6l-linux`
`nix build .#deltachat-rpc-server-x86_64-android`
and
`nix build .#deltachat-rpc-server-x86-android`
still fail, but we do not build it in CI.
