Remove unnecessary rec{s from "my" packages

pkgs/development/compilers/squeak/default.nix

@@ -2,7 +2,7 @@
 , libpthreadstubs, pango, pkgconfig, libpulseaudio, which }:
 
 let version = "4.10.2.2614"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "squeak-${version}";
 
   src = fetchurl {

pkgs/development/interpreters/picoc/default.nix

@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub, readline }:
 
 let version = "2015-05-04"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "picoc-${version}";
 
   src = fetchFromGitHub {

pkgs/development/libraries/accounts-qt/default.nix

@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitLab, doxygen, glib, libaccounts-glib, pkgconfig, qt5 }:
 
 let version = "1.13"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "accounts-qt-${version}";
 
   src = fetchFromGitLab {

pkgs/development/libraries/libcli/default.nix

@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub }:
 
 let version = "1.9.7"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "libcli-${version}";
 
   src = fetchFromGitHub {

pkgs/development/tools/misc/bin_replace_string/default.nix

@@ -1,7 +1,7 @@
 { stdenv, fetchurl, libelf, txt2man }:
 
 let version = "0.2"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "bin_replace_string-${version}";
 
   src = fetchurl {

pkgs/development/tools/parsing/flexc++/default.nix

@@ -1,7 +1,7 @@
 { stdenv, fetchurl, bobcat, icmake, yodl }:
 
 let version = "2.02.00"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "flexc++-${version}";
 
   src = fetchurl {