Fix provided features spec with --repeat 2

Author: eregon

core/kernel/require_spec.rb

@@ -32,13 +32,14 @@
 
     features.sort.should == provided.sort
 
+    requires = provided
     ruby_version_is "4.0" do
-      provided.map! { |f| f == "pathname" ? "pathname.so" : f }
+      requires = requires.map { |f| f == "pathname" ? "pathname.so" : f }
     end
 
-    code = provided.map { |f| "puts require #{f.inspect}\n" }.join
+    code = requires.map { |f| "puts require #{f.inspect}\n" }.join
     required = ruby_exe(code, options: '--disable-gems')
-    required.should == "false\n" * provided.size
+    required.should == "false\n" * requires.size
   end
 
   it_behaves_like :kernel_require_basic, :require, CodeLoadingSpecs::Method.new