stdlib: Accept keyword arguments in Net::HTTP.start
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In the original definition, keyword arguments could not be specified
without specifying all positional arguments.
Specifically, the following call results in an error with
`Ruby::ArgumentTypeMismatch`.
```rb
Net::HTTP.start('www.ruby-lang.org', 443, use_ssl: true)
```
This is because opt is treated as a hash positional argument.
This problem is solved by treating opt as a variable-length keyword argument.
ref. https://docs.ruby-lang.org/ja/latest/method/Net=3a=3aHTTP/s/start.html
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In the original definition, keyword arguments could not be specified without specifying all positional arguments.
Specifically, the following call results in an error with
Ruby::ArgumentTypeMismatch.This is because opt is treated as a hash positional argument.
This problem is solved by treating opt as a variable-length keyword argument.
ref. https://docs.ruby-lang.org/ja/latest/method/Net=3a=3aHTTP/s/start.html