privoxy: switch to openssl

mbedtls lacks a number of features (like TLS 1.3 and fragmented
handshakes) that makes everyday browsing a bit unpractical.

pkgs/tools/networking/privoxy/default.nix

···
 , nixosTests
 , fetchurl, autoreconfHook
 , zlib, pcre, w3m, man
-, mbedtls, brotli
+, openssl, brotli
 }:
 
 stdenv.mkDerivation rec {
···
   hardeningEnable = [ "pie" ];
 
   nativeBuildInputs = [ autoreconfHook w3m man ];
-  buildInputs = [ zlib pcre mbedtls brotli ];
+  buildInputs = [ zlib pcre openssl brotli ];
 
   makeFlags = [ "STRIP=" ];
   configureFlags = [
-    "--with-mbedtls"
+    "--with-openssl"
     "--with-brotli"
     "--enable-external-filters"
     "--enable-compression"
···
     description = "Non-caching web proxy with advanced filtering capabilities";
     # When linked with mbedtls, the license becomes GPLv3 (or later), otherwise
     # GPLv2 (or later). See https://www.privoxy.org/user-manual/copyright.html
-    license = licenses.gpl3Plus;
+    license = licenses.gpl2Plus;
     platforms = platforms.all;
     maintainers = [ maintainers.phreedom ];
   };