dev-perl/Test-Time: Fix missing test dependency on dev-perl/File-Slurp

dev-perl/Test-Time: Fix missing test dependency on dev-perl/File-Slurp

Really, the right thing here to do would be install dev-perl/Test-Name-FromLine
as per stated dependencies in Makefile.PL, which then in turn will pull File-Slurp.

However, this module ships Test::Name::FromLine in inc/ and consumes it from there anyway,
  degrading this actual usage to only File::Slurp.

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