oxefmsynth: use the packaged version of vst2-sdk

pkgs/by-name/ox/oxefmsynth/package.nix

@@ -4,20 +4,8 @@
   fetchFromGitHub,
   fetchzip,
   libX11,
+  vst2-sdk,
 }:
-
-let
-
-  vst-sdk = stdenv.mkDerivation rec {
-    name = "vstsdk3610_11_06_2018_build_37";
-    src = fetchzip {
-      url = "https://web.archive.org/web/20181016150224if_/https://download.steinberg.net/sdk_downloads/${name}.zip";
-      sha256 = "0da16iwac590wphz2sm5afrfj42jrsnkr1bxcy93lj7a369ildkj";
-    };
-    installPhase = "cp -r . $out";
-  };
-
-in
 stdenv.mkDerivation rec {
   pname = "oxefmsynth";
   version = "1.3.5";
@@ -31,7 +19,7 @@ stdenv.mkDerivation rec {
 
   env.NIX_CFLAGS_COMPILE = toString [ "-Wno-narrowing" ];
 
-  buildFlags = [ "VSTSDK_PATH=${vst-sdk}/VST2_SDK" ];
+  buildFlags = [ "VSTSDK_PATH=${vst2-sdk}" ];
 
   buildInputs = [ libX11 ];
 
@@ -40,11 +28,11 @@ stdenv.mkDerivation rec {
     install -Dm644 oxevst64.so -t $out/lib/lxvst
   '';
 
-  meta = with lib; {
+  meta = {
     homepage = "https://github.com/oxesoft/oxefmsynth";
     description = "Open source VST 2.4 instrument plugin";
-    maintainers = [ maintainers.hirenashah ];
+    maintainers = [ lib.maintainers.hirenashah ];
     platforms = [ "x86_64-linux" ];
-    license = licenses.gpl3Only;
+    license = lib.licenses.gpl3Only;
   };
 }