8364768: JDK javax.imageio ImageWriters do not all flush the output stream

[prrace]

4 of the 6 JDK ImageWriters flush the stream at the end of writing. 2 (TIFF and GIF) do not.

This will matter if you are using a caching ImageOutputStream.

This fix makes it consistent.

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Issue

• JDK-8364768: JDK javax.imageio ImageWriters do not all flush the output stream (Bug - P4)

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