compat: correctly force a module import in the strip backcompat code

Closed Ian Moody requested to merge topic/stable/stripbreakage into branch/stable

Just calling strip without accessing anything inside the module doesn't actually trigger the ImportError on older versions if demandimport is active, so they end up setting debugstrip as the command to wrap, and then dying with "UnknownCommand: ('debugstrip', [...etc])". See

--HG-- branch : stable

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