[ruby/openssl] Raise an error when the specified OpenSSL library directory doesn't exist.

OpenSSL built from the source creates the library directory to the
`/path/to/openssl_dir/lib64` as a default.
In the case, the `bundle exec rake compile -- --with-openssl-dir=<openssl_dir>`
cannot compile with the lib64 directory, and may compile with system OpenSSL's
libraries unintentionally. This commit is to check this case to avoid linking
with an unintentional library directory.

https://github.com/ruby/openssl/commit/ca54087462

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