Hiroshi SHIBATA

I and @unak try to use libffi provided by vcpkg. After that, We can remove the bundled source of libffi for mswin environment.

bundled source has been removed at https://github.com/ruby/ruby/commit/e4f5296f065110fa83eb450d3a861253e76e534f

I'm going to submit another PR for removing download feature.

same as https://github.com/ruby/fiddle/pull/98#issuecomment-1268187869

It seems useful.

I have no idea to support pre-build binary without ruby-build team. At least, I will not support and investigate them.

I prefer to use the binaries from ruby/ruby-builder instead of binaries of RVM because they are built by ruby-build and uses github packages.

`--with-opt-dir` is not only affect with OpenSSL. Readline, Zlib, and other libraries relied on `--with-opt-dir`. `mysql2` issue was solved with https://github.com/brianmario/mysql2/issues/1005#issuecomment-424786695 . We should use the same ssl library with...

We shouldn't care mysql2 issues in ruby-build. Unfortunately, you can resolve this issue with https://github.com/brianmario/mysql2/issues/1005#issuecomment-424786695

In my investigation, @puyo and @pstengel are miss-understanding. `mysql2` is NOT depends on OpenSSL. So, this root cause is that `libmysqlclient` build with OpenSSL provided by homebrew. Like this. ```...