MIN_PERL_VERSION is not in a recognized format.

Building with newer ExtUtils::MakeMaker versions fails:

```
Output from '/opt/perl-5.30.3t/bin/perl Makefile.PL':

Checking if your kit is complete...
Looks good
Warning: MIN_PERL_VERSION is not in a recognized format.
Recommended is a quoted numerical value like '5.005' or '5.008001'.
```

See also https://rt.cpan.org/Ticket/Display.html?id=133489