librecad: fix missing app name and icon on Wayland

Wayland uses the .desktop file to find the app name and icon. Without it being specified the correct icon is not shown.

Tested on Gnome/Wayland.

References:

  - https://community.kde.org/Guidelines_and_HOWTOs/Wayland_Porting_Notes#Application_Icon
  - https://doc.qt.io/qt-5/qguiapplication.html#desktopFileName-prop

pkgs/applications/misc/librecad/default.nix

@@ -1,5 +1,6 @@
 { boost
 , fetchFromGitHub
+, fetchpatch
 , installShellFiles
 , mkDerivationWith
 , muparser
@@ -30,6 +31,13 @@ mkDerivationWith stdenv.mkDerivation rec {
 
   patches = [
     ./fix_qt_5_11_build.patch
+    (
+      fetchpatch {
+        # Fix missing app name and icon on Wayland.
+        url = "https://github.com/LibreCAD/LibreCAD/commit/a17f8281093403f0c7c36996232665ed21906688.patch";
+        sha256 = "1x46psh4bcx2hxck4l83ki43g1252vb033i2x94h4rpai9hww4d5";
+      }
+    )
   ];
 
   postPatch = ''