ExtUtils::ParseXS: Explicitly require current version of submodules

ExtUtils::ParseXS: Explicitly require current version of submodules

Since there have been certain problems with parts of ExtUtils::ParseXS
being shadowed by older installations of the module, this commit adds
an explicit $VERSION to all submodules and requires them to have the
same version as the main module. This doesn't actually fix any problem,
but makes them more apparent as early as possible instead of failing
with obscure compile errors when bad C is generated from the original
XS.