stop using &PL_sv_yes as no-op method

Method lookup yields a fake method for ->import or ->unimport if there's
no actual method, for historical reasons so that "use" doesn't barf
if there's no import method.  This fake method used to be &PL_sv_yes
being used as a magic placeholder, recognised specially by pp_entersub.
But &PL_sv_yes is a string, which we'd expect to serve as a symbolic
CV ref.  Change method lookup to yield an actual CV with a body in this
case, and remove the special case from pp_entersub.  This fixes the
remaining part of [perl #126042].

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