Simplify SKIP message when JSON::MaybeXS is not found

[jkeenan]

It's just a test file; we don't need a full dump of the user's @INC.

[jkeenan]

While examining the latest CPAN release of the Test-Simple distribution today, I had occasion to try to install it against a fresh Perl 5 tarball. I got this message:

t/regression/247_check_ref_bool.t ................ skipped: Need JSON::MaybeXS: Can't locate JSON/MaybeXS.pm in @INC (you may need to install the JSON::MaybeXS module) (@INC entries checked: /home/jkeenan/gitwork/zzzothers/test-more/blib/lib /home/jkeenan/gitwork/zzzothers/test-more/blib/arch /home/jkeenan/testing/blead/lib/perl5/site_perl/5.41.7/x86_64-linux /home/jkeenan/testing/blead/lib/perl5/site_perl/5.41.7 /home/jkeenan/testing/blead/lib/perl5/5.41.7/x86_64-linux /home/jkeenan/testing/blead/lib/perl5/5.41.7 .) at t/regression/247_check_ref_bool.t line 5.

Do we really need a complete dump of the user's @INC? I don't think so. Any user sophisticated enough to install their own CPAN distros will know how to install a module needed for testing if they so desire.