Fix test the -ec mode in presence of clocked variable.

Indeed, I've intentionally removed the when statements in clocked local var like this :

 var
    v:int;

because the following was producing a syntax error in ecexe:

 var
    v:int when c;

But Actually, the right thing to do was to generate the following:

 var
    (v:int) when c;

...

nb : #FAILS=90->89