Do not fail on minimized systems

[KES777]

GH #23780
Perl installation fails on minimized systems.

Here we just add another test that man is available and SKIP perldoc section if it is not.

After the fix output looks like this:

ok 123 - Test that the debugger chdirs to the initial directory after a restart.
ok 124 # skip No man. This system has been minimized...
ok 125 - Test that the a command does not emit warnings on program exit.

[tonycoz]

I did consider whether testing man perlrules matched the "No manpage found" text would be better, but that could lead to silent skips when we should still be performing the test.

[jkeenan]

These 3 lines would be better placed 3 lines higher, i.e., just after the other skip statements and before the 3 local $ENV{} statements.

I think the last 2 lines would be more quickly understood if they were expressed in the positive, rather than in the negative, i.e.,

    $out =~ /^This system has been minimized/
        and skip "No man. This system has been minimized...", 1;

[tonycoz]

If the locale is non-English moving this above the environment changes may produce non-English messages, breaking the test (though I don't know if whatever produces the message pays the space cost of localizing the message.)

[Leont]

Yeah it probably should come after the localizations, but I do agree with @jkeenan that the negative match doesn't help readability here. How about

if ($out =~ /^This system has been minimized/) {
    skip "No man. This system has been minimized...", 1;
}

[jkeenan]

Assuming neither @tonycoz nor @Leont objects, I am okay with this change.

[KES777]

thanks everyone.