gamin: fix download URL for patch files

pkgs/development/libraries/gamin/debian-patches.nix

···
 # Generated by debian-patches.sh from debian-patches.txt
 let
-  prefix = "http://patch-tracker.debian.org/patch/series/dl/gamin/0.1.10-4";
+  prefix = "http://patch-tracker.debian.org/patch/series/dl/gamin/0.1.10-4.1";
 in
 [
   {