nix: rename custom -> packages

nix/packages/logisim-evolution.nix

@@ -0,0 +1,33 @@
+{
+  stdenv,
+  fetchurl,
+  jre8,
+  makeWrapper,
+}:
+stdenv.mkDerivation {
+  pname = "logisim-evolution";
+  version = "2023";
+
+  src = fetchurl {
+    url = "http://www.irisa.fr/cosi/HOMEPAGE/Derrien/logisim/logisim-evolution.jar";
+    sha256 = "sha256-24uXyTXhxxA1uwc787I+OJn+ZmqMgNIL9RE3zoRrWww=";
+  };
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin
+    makeWrapper ${jre8}/bin/java $out/bin/logisim-evolution \
+      --add-flags "-jar $src"                               \
+      --set _JAVA_AWT_WM_NONREPARENTING 1
+
+    runHook postInstall
+  '';
+
+  # NOTE: related issue
+  # https://wiki.archlinux.org/title/java#Gray_window,_applications_not_resizing_with_WM,_menus_immediately_closing
+}