Update to nss 3.16.4

This release consists primarily of CA certificate changes as listed
below, and includes a small number of bug fixes.

Notable Changes:
* The following 1024-bit root CA certificate was restored to allow more
  time to develop a better transition strategy for affected sites. It was
  removed in NSS 3.16.3, but discussion in the mozilla.dev.security.policy
  forum led to the decision to keep this root included longer in order to
  give website administrators more time to update their web servers.
  - CN = GTE CyberTrust Global Root
* In NSS 3.16.3, the 1024-bit "Entrust.net Secure Server Certification
  Authority" root CA certificate was removed. In NSS 3.16.4, a 2048-bit
  intermediate CA certificate has been included, without explicit trust.
  The intention is to mitigate the effects of the previous removal of the
  1024-bit Entrust.net root certificate, because many public Internet
  sites still use the "USERTrust Legacy Secure Server CA" intermediate
  certificate that is signed by the 1024-bit Entrust.net root certificate.
  The inclusion of the intermediate certificate is a temporary measure to
  allow those sites to function, by allowing them to find a trust path to
  another 2048-bit root CA certificate. The temporarily included
  intermediate certificate expires November 1, 2015.
phonon and nss updates
Import libmongo-client-0.1.8 as databases/libmongo-client.

This is an alternative C driver for MongoDB. It is meant to be a stable
(API, ABI and quality alike), clean, well documented and well tested shared
library, that strives to make the most common use cases as convenient
as possible.
Added databases/libmongo-client version 0.1.8
Updated x11/xscreensaver to 5.29
Add libmongo-client
Update x11/xscreensaver to 5.29.

From the changelog:

5.29    * Downgraded to Xcode 5.0.2 to make it possible to build savers
          that will still run on 10.6 and 10.7.  Sigh.
        * Updated `webcollage' for recent changes.

5.28    * Fixed some compilation problems and intermittent crashes.
        * Turned off the OSX 10.6 enable_gc hack. It didn't work.

5.27    * New hacks, `tessellimage' and `projectiveplane'.
        * Added support for pthreads, because Dave Odell is a madman.
        * Updated `webcollage' for recent changes.
        * Minor iOS tweaks to the `analogtv' hacks.
        * X11: Don't assume Suspend = 0 implies "No DPMS".
        * Minor updates to `boxed' and `klein'.
        * Fixed possible crash in `apple2', `noseguy', `xmatrix', `shadebobs'.
        * Fixed possible crash in OSX preferences.
        * OSX Performance improvements.
        * Plugged some leaks.

5.26    * More auto-updater tweaks.

5.25    * Try harder to bypass Quarrantine and Gatekeeper in OSX installer.
        * Some files were missing from the tarball.

5.24    * Added "Automatically check for updates" option on OSX.
        * Updated feed-loading for recent Flickr changes.
        * Updated `webcollage' for recent Google changes.
        * Added Instagram and Bing as `webcollage' image sources.
        * Updated to latest autoconf.
        * Bug fixes.

5.23    * New hack, `geodesic'.
        * iOS and OSX: huge XCopyArea performance improvements.
        * More heuristics for using RSS feeds as image sources.
        * Improved Wikipedia parser.
        * Updated `webcollage' for recent Flickr changes.
        * Added Android to `bsod'.
        * OSX: Added a real installer.
        * iOS and OSX: fixed a font-metrics bug.
        * iOS: Fixed aspect ratio bug in non-rotating apps when launched in
          landscape mode.
        * Made `quasicrystal' work on weak graphics cards.
        * iOS: fixed `ifs'.
        * Better compression on icons, plists and XML files: smaller
          distribution and installation footprint.
        * Reverted that DEACTIVATE change. Bad idea.
        * `Phosphor' now supports amber as well as green.
Depend on ffmpeg1 instead of ffmpeg.
Use ffmpeg1 instead of ffmpeg.
Use ffmpeg2 instead of ffmpeg and ffmpeg010.