Gradle can determine the NDK version automatically and this property is only required if multiple NDK versions are installed. The NDK version previously determined from the filename could not be parsed by Gradle anyway.
SDK 19 is the lowest API level support by SDL2 because it is the lowest API level supported by the latest NDK toolchain. According to https://www.composables.com/tools/distribution-chart this should cover virtually all Android devices.
The dependencies on Kotlin and various `androidx`-Packages were entirely unnecessary and can be removed.
Upgrade to Gradle 8.5 and Gradle Plugin 8.3.0 for compatibility with Java 21. Explicity set Java version 21 in `build.gradle`. Increment compile and target SDK version to 34 accordingly.
Remove the explicitly defined, obsolete `buildToolsVersion` property in `build.gradle`, as it is now automatically derived by Gradle.
Replace the deprecated property `android:extractNativeLibs` in `AndroidMainfest.xml` with `useLegacyPackaging` in `build.gradle`.
Replace the deprecated package definition `package="tw.DDNet"` in `AndroidMainfest.xml` with `namespace("tw.DDNet")` in `build.gradle`.
Add the required property `android:exported="true"` to the main activity in `AndroidMainfest.xml`.
