sys-libs/libxcrypt: switch to pre-generated autotools tarballs

There are actually *two* circular dependencies involving Perl:

1) Use self-generated (for now) `make dist` tarballs to avoid a circular
   dependency with libxcrypt->automake->perl->libxcrypt.

   (Thanks juippis and floppym! We noticed this because juippis hit an
   interesting edge case when using binpkgs.)

2) We initially tried to pre-generate the results of a Perl tool called
   during `./configure` in order to avoid unconditionally needing
   Perl.

   (I thought we could do this because the input is constant for all of the
   Gentoo build variants - for now.

   I later realised there's other Perl usage which we're stuck with
   for now without pre-generating a *lot*.)

   (Thanks mattst88! We noticed this while digging into suggestions
   for upstream.)

So, for now, we're just fixing 1), and adding a BDEPEND on Perl for 2) to
make it explicit.

(Both best explained within the comments of the ebuild.)

Bug: https://bugs.gentoo.org/699422
Closes: https://github.com/gentoo/gentoo/pull/21493
Reported-by: Joonas Niilola <juippis@gentoo.org>
Reported-by: Mike Gilbert <floppym@gentoo.org>
Reported-by: Matt Turner <mattst88@gentoo.org>
Signed-off-by: Sam James <sam@gentoo.org>

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