[Ecls-list] Small warning patches

[Jerry James]

Here's a small patch that fixes a handful of compiler warnings.  The
first hunk adds prototypes for some private gc functions that are used
in this file.  The second hunk fixes a typo in hash.d.  The third hunk
sets the value of interrupt_signal in all cases.  This variable is
used for comparison below, so in the else branch we want it set to a
value that will never match.  The fourth and fifth hunks just save a
little work by eliminating unused variables.  The last 2 hunks fix the
same typo.

Regards,
-- 
Jerry James
http://www.jamezone.org/
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