bug#31210: Perl graft breakage

[Leo Famulari]

On Wed, Apr 18, 2018 at 03:14:45PM -0400, Mark H Weaver wrote:
> I suggest that we add a phase to the replacement 'perl' to install a
> symlink from $out/lib/perl5/5.26.1 pointing to "5.26.2".
> 
> Would you like to try this, Leo, and push it if it solves the problem
> for you?

Thanks for your advice. The attached patch fixes the issue for me.

I would have pushed it but there is one thing I don't understand. Before
I set (replacement #f), the build would fail because the new phase was
run twice, and symlinking fails because it is not "forced" (as in `ln
-sf`). Is this expected behaviour?

0001-gnu-Perl-Fix-a-grafting-failure-due-to-a-path-that-i.patch
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