Merge branch 'master' into staging

* master: (271 commits)
  pysmbc: clarify license
  pysmbc: fix license
  bazel: 0.5.4 -> 0.6.0 (#29990)
  googler: init at 3.3
  go: declare support for aarch64
  firefox-beta-bin: 56.0b5 -> 57.0b4
  spotify: 1.0.64.401.g9d720389-21 -> 1.0.64.407.g9bd02c2d-26
  gogs: 0.11.19 -> 0.11.29
  grafana: 4.5.1 -> 4.5.2
  mopidy-iris: 3.4.1 -> 3.4.9
  nextcloud: 12.0.2 -> 12.0.3
  haskell-json-autotype: jailbreak to fix build within LTS 9.x
  kore: fix up
  kore: init at 2.0.0
  glusterfs service: fix issues with useRpcbind
  tig: 2.2.2 -> 2.3.0
  haskell-hspec-core: enable test suite again
  hackage-packages.nix: automatic Haskell package set update
  librsvg: fix thumbnailer path
  awscli: 1.11.108 -> 1.11.162
  ...

pkgs/top-level/lua-packages.nix

@@ -215,6 +215,31 @@ let
     '';
   };
 
+  lua-iconv = buildLuaPackage rec {
+    name = "lua-iconv-${version}";
+    version = "7";
+    src = fetchFromGitHub {
+      owner = "ittner";
+      repo = "lua-iconv";
+      rev = "e8d34024a6b185a759733915f116cc5588550261";
+      sha256 = "0rd76966qlxfp8ypkyrbif76nxnm1acclqwfs45wz3972jsk654i";
+    };
+
+    preBuild = ''
+      makeFlagsArray=(
+        INSTALL_PATH="$out/lib/lua/${lua.luaversion}"
+      );
+    '';
+
+    meta = {
+      platforms = stdenv.lib.platforms.unix;
+      license = stdenv.lib.licenses.mit;
+      description = "Lua bindings for POSIX iconv";
+      maintainers = [ maintainers.richardipsum ];
+      homepage = "https://ittner.github.io/lua-iconv/";
+    };
+  };
+
   luasec = buildLuaPackage rec {
     name = "sec-0.6";
     src = fetchFromGitHub {