Fix gemspec to include .jar files

Fix: #694

This was lost during the .gemspec merge and not noticed
because it was falling back to loading the jars from the
stdlib.

Author: byroot

CHANGES.md

@@ -1,5 +1,7 @@
 # Changes
 
+* Fix the java packages to include the extension.
+
 ### 2024-11-06 (2.8.0)
 
 * Emit a deprecation warning when `JSON.load` create custom types without the `create_additions` option being explictly enabled.

json.gemspec

@@ -50,6 +50,7 @@ spec = Gem::Specification.new do |s|
 
   if java_ext
     s.platform = 'java'
+    s.files += Dir["lib/json/ext/**/*.jar"]
   else
     s.extensions = Dir["ext/json/**/extconf.rb"]
     s.files += Dir["ext/json/**/*.{c,h,rl}"]