joplin-desktop: use clang_20 to fix darwin build

pkgs/by-name/jo/joplin-desktop/buildPlugin.nix

@@ -1,8 +1,10 @@
 {
   lib,
+  stdenv,
   fetchzip,
   npm-lockfile-fix,
   buildNpmPackage,
+  clang_20,
 
   name,
   url,
@@ -22,6 +24,10 @@ buildNpmPackage {
     '';
   };
 
+  nativeBuildInputs = lib.optionals stdenv.hostPlatform.isDarwin [
+    clang_20 # clang_21 breaks keytar
+  ];
+
   postPatch = ''
     sed -i '/preinstall/d' package.json
   '';

pkgs/by-name/jo/joplin-desktop/package.nix

@@ -19,6 +19,7 @@
   callPackage,
   runCommand,
   libGL,
+  clang_20,
 }:
 
 let
@@ -99,6 +100,7 @@ stdenv.mkDerivation (finalAttrs: {
   ++ lib.optionals stdenv.hostPlatform.isDarwin [
     xcbuild
     buildPackages.cctools
+    clang_20 # clang_21 breaks keytar, sqlite
   ]
   ++ lib.optionals stdenv.hostPlatform.isLinux [
     copyDesktopItems