Create Porting/pod_rules.pl, with all non perltoc.pod code from buildtoc.

pod/buildtoc now only generates pod/perltoc.pod, and only takes a --quiet
option. All the other file (re)generation code is now in Porting/pod_rules.pl.

This splits functionality which generates a new file at build time from
functionality for maintainers, which edits files in place. This permits the
unwinding of some of commit 02cc404a20a8a345, which achieved net
simplification in pod/buildtoc by merging code paths dealing with new files
(only pod/perltoc.pod) and existing files being edited.

pod_rules.pl has a --tap option, instead of buildtoc's non-standard --test
option, and defaults to --build-all if no arguments are passed. As buildtoc
now does one job, it no longer takes a --build-toc option, hence all the
Makefiles which call it need updating.

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