remove pData emulation from v8 omod interface

breaks compilation of not converted modules - but these
won't work anyways. So better change this now.
module omruleset is no longer enabled by default.

Note that it has been deprecated in v7 and been replaced by the "call"
statement. Also, it can still be build without problems, the option must
just explicitely be given.
omruleset: make work with v8 omod interface