wip on hacking around bad version::vpp
support any version.pm
update prereqs; require version 0.88 in meta, though not in code
require version 0.88 in prereqs, but not code
Support EU::MM fallback version.pm if available

For bootstrapping ExtUtils::MakeMaker before Perl 5.10, EU::MM will
soon bundle a pure-perl clone of version.pm.  This commit allows
CPAN::Meta::Requirements to use that version instead of one installed
from CPAN.

When installing this module from CPAN, version.pm will be installed
and this commit will be irrelevant, but when this module is bundled
with EU::MM for bootstrapping, it will use EU::MM's version.
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