efl/libeet, efl/libevas: use host-libjpeg instead of host-jpeg

Before creating a real virtual package named 'jpeg', we want to ensure
that no package is using the host variant of the virtual
package. Instead, we make them use directly the host-libjpeg package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>