t/import_export.pl: Removed the Safe::Isa dependency and usage t+ [ci skip]
t/import_export.pl: Removed the Safe::Isa dependency and usage t+ [ci skip]

jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF