ffmpeg 2.1.4

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
ffmpeg: update 2.1.4 bottle.

Closes #27139.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Revert "Let commands decide what mode the installer should use"

I'd still like to make this change, but at least for now the initializer
requires ignore_deps to be set correctly.

This reverts commit 881a8855b944fa9bd7dfd598bb9197f79f7a13f0.
mlt: allow GTK enabled builds

Without GTK being enabled there are no loaders for PNG images, making
things less than useful.
mlt: make GTK+ dep optional
mlt: cleanup gtk+ options for build

Make gtk+ optional with necessary dependencies on other
packages.
mlt: add 0.9.0 bottle.