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Avoid an unneeded arraycopy in UncompressedLZMA2OutputStream master

Avoid an unneeded arraycopy in UncompressedLZMA2OutputStream

If uncompBuf is empty and UncompressedLZMA2OutputStream.write is called
with len >= 64 KiB, then a full LZMA2 chunk can be copied directly from
the input buffer to the output stream. This can improve speed by a tiny
amount in specific use cases.

Suggested-by: Daniel Wilhelm <wilhelm@appwork.org>

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