Remove unneeded download from fltk

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk@14855 af4574ff-66df-0310-9fd7-8a98e5e911e0
Update to gstreamer and plugins, including gst-libav version 1.4.4.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk@14856 af4574ff-66df-0310-9fd7-8a98e5e911e0