6989471: compiler warnings building java/zip native code

[Xueming Shen]

Alan, Kelly,

Would you please help review the patch that tries to address those 
compiler warning
in zip area?

http://cr.openjdk.java.net/~sherman/6989471/webrev 
<http://cr.openjdk.java.net/%7Esherman/6989471/webrev/>

I added some comments to document the fact that 
ZIP_Read/FindEntry/InflateFully can't
deal with > 2**32 byte (the only user of these native method is the vm, 
I don't think they
are trying to de-compress a > 4G entry in one invocation any time soon). 
We might find
interesting to support > 2**32 entry for those methods, but obviously it 
is not the purpose
of this bug.

Same for the "dstLen" of the compress/uncompress methods, the original 
zlib interface
has the limitation of 2**32. I only tried to remove the warning in this 
patch.

I'm not dealing with the POSIX strdup warning.

It appears Kumar has already address the warning in zcrc32.c.

Thanks,
Sherman
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