Use NDK 27

Author: hamishmack

overlays/android.nix

@@ -5,11 +5,11 @@ final: prev: {
       examples = prev.lib.systems.examples // {
         aarch64-android = prev.lib.systems.examples.aarch64-android // {
           androidSdkVersion = "269";
-          androidNdkVersion = "24";
+          androidNdkVersion = "27";
         };
         armv7a-android-prebuilt = prev.lib.systems.examples.armv7a-android-prebuilt // {
           androidSdkVersion = "26";
-          androidNdkVersion = "24";
+          androidNdkVersion = "27";
         };
       };
     };