RFR: 8296431 - PushbackInputStream should override transferTo [v5]

[Markus KARG]

On Wed, 9 Nov 2022 07:11:53 GMT, Markus KARG <duke at openjdk.org> wrote:

>> This PR implements JDK-8296431
>
> Markus KARG has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removed unused imports

@bplb Is there more you like to get changed?

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PR: https://git.openjdk.org/jdk/pull/10999