libidn2: init at 0.16

wget now needs libidn2 instead of libidn.

cc #22416

pkgs/development/libraries/libidn2/default.nix

@@ -0,0 +1,34 @@
+{ fetchurl, stdenv, libiconv, libunistring }:
+
+stdenv.mkDerivation rec {
+  name = "libidn2-0.16";
+
+  src = fetchurl {
+    url = "https://alpha.gnu.org/gnu/libidn/${name}.tar.gz";
+    sha256 = "13v8kh4d5nfkymai88zlw3h7k4x9khrpdpv97waf4ah8ykzrxb9g";
+  };
+
+  outputs = [ "bin" "dev" "out" "info" "devdoc" ];
+
+  buildInputs = [ libunistring ]
+    ++ stdenv.lib.optional stdenv.isDarwin libiconv;
+
+  meta = {
+    homepage = "https://www.gnu.org/software/libidn/#libidn2";
+    description = "Free software implementation of IDNA2008 and TR46";
+
+    longDescription = ''
+      Libidn2 is believed to be a complete IDNA2008 and TR46 implementation,
+      but has yet to be as extensively used as the IDNA2003 Libidn library.
+
+      The installed C library libidn2 is dual-licensed under LGPLv3+|GPLv2+,
+      while the rest of the package is GPLv3+.  See the file COPYING for
+      detailed information.
+    '';
+
+    repositories.git = https://gitlab.com/jas/libidn2;
+    license = with stdenv.lib.licenses; [ lgpl3Plus gpl2Plus gpl3Plus ];
+    platforms = stdenv.lib.platforms.all;
+    maintainers = with stdenv.lib.maintainers; [ fpletz ];
+  };
+}