[Development] Retiring libtiff too

[Thiago Macieira]

See https://lists.clearlinux.org/pipermail/dev/2016-April/000290.html

This is yet another reason we have to stop bundling third party components, 
especially the image and movie formats.

So I recommend dropping the libtiff 3rdparty component and keep the plugin for 
when the system library is found. Our binaries should not include libqtiff.
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center