ffmpeg: rework update script

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Make download-* targets display "[download] *" instead of log

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Merge pull request #343 from TimothyGu/codename-clarity

Make download-* targets display "[download] *" instead of log
Merge pull request #342 from TimothyGu/new-ff

ffmpeg: rework update script
update package sqlite
Package libcroco: Enable shared build.
Package librsvg: Enable shared build, fix dependency.
Merge pull request #344 from TobiX/master

Shared build for libcroco and librsvg