obj_destroy, called with more than one parameter, passes extra

[slayoo]

As reported by @maynardGK at SF.net (https://sourceforge.net/p/gnudatalanguage/bugs/700/):

.cleanup returns an exception when obj_destroy is called with more than one argument. Evidently ti is seeing the caller's arguments.

$ gdl096

  GDL - GNU Data Language, Version 0.9.6 CVS 03/19

- For basic information type HELP,/INFO
- Please report bugs, feature or help requests and patches at:
  http://sourceforge.net/projects/gnudatalanguage/

GDL> tst=list(indgen(4),/ex)
GDL> tst1=list(indgen(4),/ex)
GDL> obj_destroy,tst1,tst
% CLEANUP: Incorrect number of arguments.
% Execution halted at: $MAIN$

    void obj_destroy( EnvT* e)
;...
;      BaseGDL* p= e->GetParDefined( 0);...
;      DObjGDL* op= static_cast<DObjGDL*>(p);
;      SizeT nEl=op->N_Elements();
;      for( SizeT i=0; i<nEl; i++)     {
;                 DObj actID=(*op)[i];
;                 e->ObjCleanup( actID);

Apparently addressed here (part of #32):
be6c58b