The minimum supported API version must be specified when building the native libraries, otherwise this may cause linking errors when launching the app.
The minimum API level is increased to 24 (Android 7.0, covering 97.2% of usages) because:
- Vulkan is only available from API 24+ on ARM64 and x64.
- curl only compiles with API 23+.
- The NDK version we use supports only API 21+.
Ensure that the C++/Linker flags are set when building Android libraries, which was causing errors due to `-fPIC` not being set for all libraries.
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`.
