libav 9.11

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
libav: add 9.11 bottle.

Closes #27133.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
mlt: allow GTK enabled builds

Without GTK being enabled there are no loaders for PNG images, making
things less than useful.
mlt: add 0.9.0 bottle.