autodoc: Remove useless loop

Commit ef30258 added this loop, but
there was a logic error.  It also added a loop above it that completely
empties the hash this loop is iterating over.  Hence there is never
anything there by the time this loop is encountered.

autodoc.pl

@@ -1974,9 +1974,6 @@ sub add_defn  {
     warn "no docs for $_\n";
 }
 
-for my $key (sort keys %deferreds) {
-    warn "no docs for $key\n";
-}
 
 foreach (sort keys %missing) {
     warn "Function '$_', documented in $missing{$_}, not listed in embed.fnc"