More tweaks for Ruby integration

[samuel40791765]

Description of changes:

Ruby depends on some additional SSL flags and retrieving DH from EVP_PKEY_get0 with EVP_PKEY_DH (which were both recently added).
There were a couple test failures in test_cipher.rb that were relatively easy to fix.

❯ make test-all TESTS=../test/openssl/test_cipher.rb
config.status: creating ruby-runner.h
making mjit_build_dir.so
Run options: 
  --seed=38192
  "--ruby=./miniruby -I../lib -I. -I.ext/common  ../tool/runruby.rb --extout=.ext  -- --disable-gems"
  --excludes-dir=../test/excludes
  --name=!/memory_leak/

# Running tests:

Finished tests in 0.058507s, 324.7500 tests/s, 1982.6843 assertions/s.           
19 tests, 116 assertions, 0 failures, 0 errors, 0 skips

ruby -v: ruby 3.1.6p260 (2024-09-10 revision 30d00a0b43) [x86_64-linux]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.54%. Comparing base (c664abe) to head (3afb2c2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1852      +/-   ##
==========================================
- Coverage   78.56%   78.54%   -0.02%     
==========================================
  Files         583      583              
  Lines       98807    98809       +2     
  Branches    14161    14159       -2     
==========================================
- Hits        77623    77608      -15     
- Misses      20558    20573      +15     
- Partials      626      628       +2     

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