HPCC-9447 If libRembed is present, eclcc malfunctions on some systems

On some systems, unloading libRembed (and thus unloading the Rcpp, RInside,
and related objects) seems to cause stdin to be closed.

Providing dummy ecl and module name values means that the plugin will not be
unloaded, hopefully avoiding the issue.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>