RFR: 8300863: Remove C-style array declarations in java.io

[Iris Clark]

On Mon, 23 Jan 2023 13:53:38 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> Some variables are declared using old-style declarations. These should be modified to conform to modern style. 
> 
> This is a task derived from https://github.com/openjdk/jdk/pull/11848

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/12139