build: update tokio to 1.39 and Android NDK to r27

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.

Cargo.toml

@@ -180,14 +180,7 @@ serde_json = "1"
 serde = "1.0"
 tempfile = "3.10.1"
 thiserror = "1"
-
-# 1.38 is the latest version before `mio` dependency update
-# that broke compilation with Android NDK r23c and r24.
-# Version 1.39.0 cannot be compiled using these NDKs,
-# see issue <https://github.com/tokio-rs/tokio/issues/6748>
-# for details.
-tokio = "~1.38.1"
-
+tokio = "1"
 tokio-util = "0.7.11"
 tracing-subscriber = "0.3"
 yerpc = "0.6.2"

flake.nix

@@ -18,9 +18,9 @@
         manifest = (pkgs.lib.importTOML ./Cargo.toml).package;
         androidSdk = android.sdk.${system} (sdkPkgs:
           builtins.attrValues {
-            inherit (sdkPkgs) ndk-24-0-8215888 cmdline-tools-latest;
+            inherit (sdkPkgs) ndk-27-0-11902837 cmdline-tools-latest;
           });
-        androidNdkRoot = "${androidSdk}/share/android-sdk/ndk/24.0.8215888";
+        androidNdkRoot = "${androidSdk}/share/android-sdk/ndk/27.0.11902837";
 
         rustSrc = nix-filter.lib {
           root = ./.;
@@ -257,13 +257,21 @@
 
         androidAttrs = {
           armeabi-v7a = {
-            cc = "armv7a-linux-androideabi19-clang";
+            cc = "armv7a-linux-androideabi21-clang";
             rustTarget = "armv7-linux-androideabi";
           };
           arm64-v8a = {
             cc = "aarch64-linux-android21-clang";
             rustTarget = "aarch64-linux-android";
           };
+          x86 = {
+            cc = "i686-linux-android21-clang";
+            rustTarget = "i686-linux-android";
+          };
+          x86_64 = {
+            cc = "x86_64-linux-android21-clang";
+            rustTarget = "x86_64-linux-android";
+          };
         };
 
         mkAndroidRustPackage = arch: packageName: