Merge "Load extractors from libs/extractors/ if present"

    ALOGV("search for plugins at %s", libDirPath);

    ALOGV("linked libs %s", gLinkedLibraries.c_str());

    std::string libDirPathEx = libDirPath;

    libDirPathEx += "/extractors";

    android_namespace_t *extractorNs = android_create_namespace("extractor",

            nullptr,  // ld_library_path

            libDirPath,

            libDirPath,  // default_library_path

            ANDROID_NAMESPACE_TYPE_ISOLATED,

            nullptr,  // permitted_when_isolated_path

            libDirPathEx.c_str(),  // permitted_when_isolated_path

            nullptr); // parent

    if (!android_link_namespaces(extractorNs, nullptr, gLinkedLibraries.c_str())) {

        ALOGE("Failed to link namespace. Failed to load extractor plug-ins in apex.");

        .library_namespace = extractorNs,

    };

    DIR *libDir = opendir(libDirPath);

    // try extractors subfolder first

    DIR *libDir = opendir(libDirPathEx.c_str());

    if (libDir) {

        libDirPath = libDirPathEx.c_str();

    } else {

        libDir = opendir(libDirPath);

    }

    if (libDir) {

        struct dirent* libEntry;

        while ((libEntry = readdir(libDir))) {