Bug#842082: torch-core-free: uninstallable on architectures without lua-torch-image

[lumin]

Hi,

Thank you for pointing this out, I noticed it.

Actually I plan to add all of its runtime dependencies
to its B-D list and add autopkgtest support for this
package. In this way the installation failure issue
on any architecture will be eliminated.

Will fix it in 1~exp2 .