Make HStdout and HStderr Copy.

[m-ou-se]

This makes it possible to pass it around by value, use a Cell<HStdout>, etc.

[rust-highfive]

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[m-ou-se]

This only makes sense because the crate doesn't close() the streams. Do we want to implement calling close() on drop at some point? If so, this shouldn't be merged.

[adamgreig]

I don't see why we'd need to call close(), and anyway if we do it just means the writes on the other instances will start failing with errors, which isn't unsafe. Personally I'm in favour of this PR but I'll give other @rust-embedded/cortex-m people a chance to chime in since it's a bit of a semantic change.

[adamgreig]

If no one else has comments let's get this merged. Thanks!

bors r+

[bors]

Build succeeded

• continuous-integration/travis-ci/push