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String taskNamePrefix = "transformNativeLibsWithMergeJniLibsFor"
if (!task.name.startsWith(taskNamePrefix)) {
    return
}
…

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...
// Full description will be something like "appname_flavor_buildType"
String fullDescription = task.name
        .substring(taskNamePrefix.size())
        .toLowerCase()

String taskPath = null
android.applicationVariants.all { variant ->
    if (fullDescription.contains(variant.flavorName.toLowerCase())
            && fullDescription.contains(variant.buildType.name.toLowerCase())) {

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...
if (taskPath != null) {
    copyNativeLibs(taskPath)
}

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def copyNativeLibs(taskPath) {
    // The native libraries will be found somewhere under the root directory 
    // defined below. From there, the armeabi sub-directory needs to be found.
    File rootDir = new File(
            projectDir,
            "build/intermediates/transforms/mergeJniLibs/${taskPath}/"
    )
    if (!rootDir.isDirectory()) return
    def srcDir = searchForDirectory("armeabi", rootDir)
    if (srcDir == null) return

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private File searchForDirectory(String name, File currentDirectory) {
    for (file in currentDirectory.listFiles()) {
        if (file.isDirectory() && file.name == name) {
            return file
        }

        if (file.isDirectory()) {
            File result = searchForDirectory(name, file)
            if (result != null) {
                return result

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// Sets the supported res configurations. By default resources for all languages,
// densities, and screen sizes are included in each build. However, a subset can be 
// specified (e.g. en,ko). This will speed up build times considerably, but should 
// only be done for developer builds.
ext.supportedResConfigs = project.hasProperty('supportedResConfigs') ?
        project.getProperty('supportedResConfigs').split(",") :
        null

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# Supported res configurations. If left commented, all languages, densities, and sizes 
# will be included in the build. Uncomment to only include a subset. This should be a 
# comma delimited list (e.g. supportedResConfigs=en,fr,ko).
supportedResConfigs=en

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// ...
apply from: "$rootDir/gradle/buildTasks.gradle"
android {
    // ...
    defaultConfig {
        if (project.supportedResConfigs != null) {
            resConfigs project.supportedResConfigs
        }
        // ...
    }

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// ...
android {
    // ...
    defaultConfig {
        resConfigs "en"
        // ...
    }
// ...
}

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supportedResConfigs=en,notnight,port