[Perl/perl5] e763b1: Adjust search for @INC when testing in core distro

[James E Keenan]

  Branch: refs/heads/smoke-me/jkeenan/sawyerx/findbin-duallife
  Home:   https://github.com/Perl/perl5
  Commit: e763b14b4ee98fc1d49aecb0702ab0ca8ca0e1b4
      
https://github.com/Perl/perl5/commit/e763b14b4ee98fc1d49aecb0702ab0ca8ca0e1b4
  Author: James E Keenan <jkee...@cpan.org>
  Date:   2019-11-06 (Wed, 06 Nov 2019)

  Changed paths:
    M dist/FindBin/t/FindBin.t

  Log Message:
  -----------
  Adjust search for @INC when testing in core distro