We removed the ability to automatically load extensions from jars
many years ago, but this test remained. It only continued to pass
because some other library loaded the 'json' library which meant
that the tested classes were available. When this same example is
run outside of the test suite, it fails:

```
$ cx jruby-10.0.2.0 ruby -e "require 'uri:file:./lib/ruby/stdlib/json/ext/parser'; p JSON::Ext::Parser"
NameError: uninitialized constant JSON::Ext::Parser
  const_missing at org/jruby/RubyModule.java:4866
         <main> at -e:1
```

Because this functionality no longer exists, I am removing the
test.

A few additional stdlib were added in 4.0 so this archive is now
a bit larger.

* Removed SortedSet and related files (gem TBD).
* Removed stdlib .rb stub.
* Fixed inspect output, intersect? with Array, and infinite
  enumerables for new tests.
* Moved @hash variable to a bound Java field.

* Fix inspect output expectations.
* Guard SortedSet tests behind a require, since that collection is
  now in a separate library (knu/sorted_set). These tests probably
  should move to the external library once we work out the details
  (see knu/sorted_set#7)

Based on code from CRuby by Tomoya Ishida:

ruby/ruby#13680

When the incoming block's signature is important to the iteration
method being called, the previous logic would hide that signature.
The change here propagates it through the CallBlock.

This does not exactly match the new native Set impl, but it passes
specs and tests related to initialize.

This updates some logic related to the new native Set.

Only fails are now related to us not tracking iteration-in-progress
for either Set or Hash.

We'll address these in jruby-openssl via fixes in
jruby/jruby-openssl#341 etc.

See #9271

Test on MacOS

Not sure yet if there's a way to have separate open and connect
timeouts with JVM sockets.

Still not sure I get what "outer" is intended to mean but this
matches CRuby and now there's an equivalent function for
rb_exec_recursive.

This ensures appropriate encoding and path conversion errors are
raised.

See #9275

See #9276

Not yet implemented on SSLSocket.

See jruby/jruby-openssl#342

Unimplemented because I'm unsure how we can provide HEv2 atop JVM
sockets.

See ruby/ruby#11653

All relate to the same failing behavior in the HTTP server it sets
up.

See #9276

See #9270