rsync: add patch for CVE-2020-14387

(cherry picked from commit a08ee2292caa8a676332c695d7d46bd38c235931)

pkgs/applications/networking/sync/rsync/base.nix

@@ -1,4 +1,4 @@
-{ lib, fetchurl }:
+{ lib, fetchurl, fetchpatch }:
 
 rec {
   version = "3.2.3";
@@ -12,6 +12,13 @@ rec {
     url = "mirror://samba/rsync/rsync-patches-${version}.tar.gz";
     sha256 = "1wj21v57v135n6fnmlm2dxmb9lhrrg62jgkggldp1gb7d6s4arny";
   };
+  extraPatches = [
+    (fetchpatch {
+      name = "CVE-2020-14387.patch";
+      url = "https://git.samba.org/?p=rsync.git;a=patch;h=c3f7414;hp=4c4fce51072c9189cfb11b52aa54fed79f5741bd";
+      sha256 = "000lyx48lns84p53nsdlr45mb9558lrvnsz3yic0y3z6h2izv82x";
+    })
+  ];
 
   meta = with lib; {
     description = "Fast incremental file transfer utility";