Support EGL_KHR_partial_update without EGL_EXT_buffer_age

void EglManager::initExtensions() {

    auto extensions = StringUtils::split(

            eglQueryString(mEglDisplay, EGL_EXTENSIONS));

    EglExtensions.bufferAge = extensions.has("EGL_EXT_buffer_age");

    // For our purposes we don't care if EGL_BUFFER_AGE is a result of

    // EGL_EXT_buffer_age or EGL_KHR_partial_update as our usage is covered

    // under EGL_KHR_partial_update and we don't need the expanded scope

    // that EGL_EXT_buffer_age provides.

    EglExtensions.bufferAge = extensions.has("EGL_EXT_buffer_age")

            || extensions.has("EGL_KHR_partial_update");

    EglExtensions.setDamage = extensions.has("EGL_KHR_partial_update");

    LOG_ALWAYS_FATAL_IF(!extensions.has("EGL_KHR_swap_buffers_with_damage"),

            "Missing required extension EGL_KHR_swap_buffers_with_damage");