All packages using Perl vendorarch directory need a perlapi-* dependency

All packages using Perl vendorarch directory need a perlapi-* dependency

Having $Config{vendorarch} change between Perl major versions (for
multiarch or other reasons) implies that packages using it need a strict
dependency on those versions of perl-base that have a compatible search
path (@INC).

The vast majority of these packages are binary ("XS") modules, where we
already require a dependency on the virtual package perlapi-*, provided
by perl-base. The name of this virtual package will change when the
interface between the Perl interpreter and the modules changes.

If we consider @INC part of that interface, we can use the existing
mechanism also for the few nonbinary modules using $Config{vendorarch}.
This is a new requirement that currently affects six packages in
the archive.