shadowsocks-libev: misc cleanup

- Replace rec with finalAttrs pattern
- Switch to SRI hashes
- Drop use of with lib;

pkgs/by-name/sh/shadowsocks-libev/package.nix

@@ -15,7 +15,7 @@
   libxslt,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "shadowsocks-libev";
   version = "3.3.5";
 
@@ -23,8 +23,8 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner = "shadowsocks";
     repo = "shadowsocks-libev";
-    tag = "v${version}";
-    sha256 = "1iqpmhxk354db1x08axg6wrdy9p9a4mz0h9351i3mf3pqd1v6fdw";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-vDmzQ8N3uDpiKCNB8CtR6SbfMjevKwR6WI2UMTusF8c=";
     fetchSubmodules = true;
   };
 
@@ -79,15 +79,15 @@ stdenv.mkDerivation rec {
     cp lib/* $out/lib
   '';
 
-  meta = with lib; {
+  meta = {
     description = "Lightweight secured SOCKS5 proxy";
     longDescription = ''
       Shadowsocks-libev is a lightweight secured SOCKS5 proxy for embedded devices and low-end boxes.
       It is a port of Shadowsocks created by @clowwindy, which is maintained by @madeye and @linusyang.
     '';
     homepage = "https://github.com/shadowsocks/shadowsocks-libev";
-    license = licenses.gpl3Plus;
+    license = lib.licenses.gpl3Plus;
     maintainers = [ ];
-    platforms = platforms.all;
+    platforms = lib.platforms.all;
   };
-}
+})