fix an issue that rdoc fails when running on Windows with RUBYOPT=-U #430
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rdoc sometimes failes when it runs on Windows with RUBYOPT=-U environment variable setting.
I confirmed this issue in following environment and process.
"rdoc --debug" showed encoding errors, so I tried to fix this by
Regarding the first one, a change of open-mode to "rb" works fine too.
But this method has rescue line including a relevant comment, so I chose the above modification.
After this changes, rdoc works fine so far.