dev-perl/Module-Runtime: Remove Pod Authortests.

dev-perl/Module-Runtime: Remove Pod Authortests.

This removes the various (optional) POD tests and the related
dependencies as they can never serve an end user any benefit about
reporting their dist broken.

All it can do is introduce more things that break, and more dependencies
for stabilization.

Module::Runtime is hence the most used package that does this still.

Incidentally, removing these dependencies unbreaks the dependecy subgraph
on m68k

Package-Manager: portage-2.3.0
RepoMan-Options: --include-arches="alpha amd64 amd64-fbsd arm arm64 hppa ia64 m68k mips nios2 ppc ppc64 riscv s390 sh sparc sparc-fbsd x86 x86-fbsd"