treewide: remove redundant rec

pkgs/tools/backup/bup/default.nix

@@ -9,7 +9,7 @@ let version = "0.29.2"; in
 
 with stdenv.lib;
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "bup";
   inherit version;
 

pkgs/tools/backup/easysnap/default.nix

@@ -1,6 +1,6 @@
 {stdenv, fetchFromGitHub, zfs }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "easysnap";
   version = "unstable-2019-02-17";
 

pkgs/tools/backup/flockit/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, runtimeShell }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "flockit";
   version = "2012-08-11";
 

pkgs/tools/backup/ori/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchurl, boost, pkgconfig, scons, utillinux, fuse, libevent, openssl, zlib }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   version = "0.8.1";
   pname = "ori";
 

pkgs/tools/backup/rdup/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, pkgconfig, autoreconfHook, glib, pcre }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "rdup";
   version = "1.1.15";
 

pkgs/tools/backup/rsbep/default.nix

@@ -1,6 +1,6 @@
 { stdenv, lib, coreutils, gnused, gawk, fetchurl }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "rsbep";
   version = "0.1.0";
 

pkgs/tools/backup/zbackup/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, cmake, zlib, openssl, protobuf, protobufc, lzo, libunwind } :
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "zbackup";
   version = "1.4.4";
   src = fetchurl {

pkgs/tools/backup/znapzend/default.nix

@@ -23,7 +23,7 @@ let
   version = "0.18.0";
   checksum = "1nlvw56viwgafma506slywfg54z6009jmzc9q6wljgr6mqfmmchd";
 in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   pname = "znapzend";
   inherit version;