[Ecls-list] Fix for a fix

[Juan Jose Garcia Ripoll]

Hi,

yesterday I made a fix so that DLLs may be reclaimed by the garbage collector. 
This implied changes in the way Cblocks (Lisp objects for DLLs) are created, 
but I forgot to update main.d. That resulted in random crashes of ECL -- 
really random, so that they did not happen in my machine until today --. I 
have fixed this.

Juanjo