package/libevas-generic-loaders: add missing MMU dependency

The MMU dependency from glib2 via librsvg was not propagated
to the SVG loader.

Reported-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>