Enable different build numbers for different ABIs.

build.gradle

android {
//.....
}
// map for the version code that gives each ABI a value. make sure to list all ABIs mentioned in splits block, an keep the order.
ext.versionCodes = ['armeabi': 3, 'armeabi-v7a': 4, 'arm64-v8a': 5, mips: 6, 'x86': 7, 'x86_64': 8]
import com.android.build.OutputFile

// For each APK output variant, override versionCode with a combination of
// ABI APK value * 1000 + defaultConfig.versionCode
android.applicationVariants.all { variant ->
    // assign different version code for each output
    variant.outputs.each { output ->
        output.versionCodeOverride =
                project.ext.versionCodes.get(output.getFilter(OutputFile.ABI)) * 1000 + android.defaultConfig.versionCode
    }
}