RFR: removing dead code from jar tool

[Lance Andersen]

I think this looks OK.  I did a search and did not find any usages so I suspect this should be safe to do.

Best
Lancee

> On Feb 28, 2020, at 5:28 AM, Adam Sotona <adam.sotona at oracle.com> wrote:
> 
> Hi,
> I would like to ask for review of the attached patch removing dead code from jar tool
> Class files sun.tools.jar.Manifest and sun.tools.jar.SignatureFile appear to be dead code and should be removed.
> Build with the patch passes all Tier1, Tier2 and Tier3 tests. 
> 
> Thank you,
> Adam
> 

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