add plugin param to desktop build

Author: qui-jason

dargon2_flutter/dargon2_flutter_desktop/pubspec.yaml

@@ -34,10 +34,13 @@ flutter:
     platforms:
       linux:
         pluginClass: Dargon2FlutterDesktopPlugin
+        ffiPlugin: true
       macos:
         pluginClass: Dargon2FlutterDesktopPlugin
+        ffiPlugin: true
       windows:
         pluginClass: Dargon2FlutterDesktopPlugin
+        ffiPlugin: true
 
   # To add assets to your plugin package, add an assets section, like this:
   # assets:

dargon2_flutter/dargon2_flutter_mobile/pubspec.yaml

@@ -37,4 +37,3 @@ flutter:
       ios:
         dartPluginClass: DArgon2Mobile
         ffiPlugin: true
-