Signed-off-by: Mingxiang Xue <mingxiangxue@gmail.com>

compatible with macOS 11

Add definition for JRuby 9.2.12.0

https://www.jruby.org/2020/07/01/jruby-9-2-12-0.html

Update rbx scripts and Added the latest definitions

Fix a bash 4.4 warning when installing jruby

add mruby 2.1.1

The existing install function wiped out the prefix that build_package_copy
copied the binaries to. The subsequently created symlinks point to files
that don't exist on disk.

The list `rbenv install -l` is too long, show latest stable releases by default

In particular, the following:

```
/path/to/bin/ruby-build: line 739: warning: command substitution: ignored null byte in input
```

Add artichoke-dev to install the latest Artichoke nightly build

Allow to install the latest official Artichoke nightly build from https://github.com/artichoke/nightly/releases

CVE-2020-1967, bump openssl to 1.1.1g

mark ruby 2.5 as security maintenance

s/all built-in definitions/all local definitions/

Update to OpenSSL 1.1.1f for Ruby 2.5+

ruby-build 20200401

Add definition for JRuby 9.2.11.1

add definition 2.4.10, 2.5.8, 2.6.6, 2.7.1 and ruby 2.4 EOL

JRuby 9.2.11.1 has been released.
https://www.jruby.org/2020/03/25/jruby-9-2-11-1

"available" implies ruby-build will be checking online sources but
actually ruby-build doesn't do that. "local definitions" may be
prefered.

Pointed out by jasonkarns.