Remove code targeted to Test::Builder 1.5

[szabgab]

As Test::Builder 1.5 is dead, it would be better to just remove code that still uses it:

https://metacpan.org/source/ETHER/Test-Class-0.50/lib/Test/Class.pm#L235

The ->history method doesn't exist in the Test2-based Test::Builder.

The detailed reason is explained in Test2::Transition:
https://metacpan.org/pod/distribution/Test-Simple/lib/Test2/Transition.pod#Test::Builder1.5-2-conditionals

Original: https://rt.cpan.org/Ticket/Display.html?id=115577