mpd_clientlib: rename to libmpdclient

The name libmpdclient is the original name of the project, and it is the most
used by other projects and package managers. Also, there is no reason why not to
use the name libmpdclient.

pkgs/servers/mpd/libmpdclient.nix

@@ -0,0 +1,30 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, meson
+, ninja
+, fixDarwinDylibNames
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libmpdclient";
+  version = "2.19";
+
+  src = fetchFromGitHub {
+    owner  = "MusicPlayerDaemon";
+    repo   = pname;
+    rev    = "v${version}";
+    sha256 = "01agvjscdxagw6jcfx0wg81c4b6p8rh0hp3slycmjs2b835kvmq2";
+  };
+
+  nativeBuildInputs = [ meson ninja ]
+  ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
+
+  meta = with lib; {
+    description = "Client library for MPD (music player daemon)";
+    homepage = "https://www.musicpd.org/libs/libmpdclient/";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ ehmry AndersonTorres ];
+    platforms = platforms.unix;
+  };
+}