TOOLS/zsh.pl: sort options in reverse order by length

This stops options that are prefixes of other options from blocking
completion of values for the longer ones.

TOOLS/zsh.pl

@@ -133,5 +133,14 @@ sub parse_opts {
         push @list, $entry
     }
 
+    if ($parsing_main_options) {
+        @list = sort {
+            $a =~ /(.*?)\:/; my $ma = $1;
+            $b =~ /(.*?)\:/; my $mb = $1;
+
+            length($mb) <=> length($ma)
+        } @list;
+    }
+
     return @list;
 }