krita: Fix build dependencies

First of all, we need a newer version of Vc, because at least version
1.1.0 is required for Krita 3.1.3.

Also, qtmultimedia and qtx11extras were missing.

Built and tested successfully on my machine.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Cc: @abbradar