GTK update. patch by Vincent Torri.

GTK update. patch by Vincent Torri.
  fixed:
cleaning of Makefile
time elapsed seems broken ('total time' label replaced by 'time remaining')
text entries of the status window are now not editable
  added:
compilation from x264/ (add --enable-gtk option to configure)
shared lib creation if --enable-shared is passed to configure
x264gtk.pc
--b-rdo, --no-dct-decimate

git-svn-id: svn://svn.videolan.org/x264/trunk@539 df754926-b1dd-0310-bc7b-ec298dee348c