dtools: rdmd -> dtools

- Remove single rdmd derivation and introduce new dtools derivation with more tools from the repository.
- Update rdmd/dtools 2.067.0 -> 2.075.1
- Adding checkPhase
- Fixing dependencies
- Update derivation description

pkgs/development/compilers/rdmd/default.nix

@@ -1,28 +0,0 @@
-{stdenv, lib, fetchurl, dmd}:
-
-stdenv.mkDerivation {
-  name = "rdmd-2.067.0";
-
-  buildInputs = [ dmd ];
-
-  src = fetchurl {
-    url = "https://github.com/D-Programming-Language/tools/archive/v2.067.0.tar.gz";
-    sha256 = "2702ecda0427c675084d9b688449bc8c8392fd73e30257d79e2488640d5a9982";
-  };
-
-  buildPhase = ''
-    dmd rdmd.d
-  '';
-
-  installPhase = ''
-    mkdir -p $out/bin
-    cp rdmd $out/bin/
-	'';
-
-  meta = {
-    description = "Wrapper for D language compiler";
-    homepage = http://dlang.org/rdmd.html;
-    license = lib.licenses.boost;
-    platforms = stdenv.lib.platforms.unix;
-  };
-}