Fix gemspec

ruby-hdf5.gemspec

@@ -13,18 +13,12 @@ Gem::Specification.new do |spec|
   spec.license = 'MIT'
   spec.required_ruby_version = '>= 3.2.0'
 
-  # Specify which files should be added to the gem when it is released.
-  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files = Dir.chdir(__dir__) do
-    `git ls-files -z`.split("\x0").reject do |f|
-      (File.expand_path(f) == __FILE__) || f.match(%r{\A(?:(?:bin|test|spec|features)/|\.(?:git|circleci)|appveyor)})
-    end
-  end
+  spec.files         = Dir["*.{md,txt}", "{lib}/**/*", "vendor/*.{so,dylib,dll}"]
+  spec.require_path  = "lib"
   spec.require_paths = ['lib']
 
   spec.add_dependency 'ffi'
   spec.add_dependency 'pkg-config'
 
-  # For more information and examples about making a new gem, check out our
-  # guide at: https://bundler.io/guides/creating_gem.html
+  spec.metadata["msys2_mingw_dependencies"] = "hdf5"
 end