Despite being just a packaging update, this update packs quite a few changes.

To start things off, we're finally passing perl's testsuite on at least
x86/musl. There are a lot of skipped tests left, as well as some oddities.
Nothing too heavy though. Making this happen was an ongoing effort since the
perl-5.20.1 release.
We still can't run module testsuites and I don't expect all target/libc
combinations to pass yet. So we'll leave test suite support marked as
experimental.

We've also switched from the old collection of target-specific configuration
files to a new, more flexible and easier-to-maintain system based on
perlconfig.pl. It'll generate a suitable configuration file using information
found in it's *.config files as well as command-line parameters passed.
See the POD and files/README.config for details.

Signed-off-by: Marcel Denia <naoir@gmx.net>