RFR: 8218021: jarsigner strips the execute permission when signing a .zip file

[Seán Coffey]

Hi,

Looking to introduce some JDK private functionality which will help 
preserve internal zip file attribute permissions when jarsigner is run 
on a zip file. Some of the logic is taken from the recent work carried 
out in this area for zipfs API.

https://bugs.openjdk.java.net/browse/JDK-8218021
http://cr.openjdk.java.net/~coffeys/webrev.8218021/webrev/

regards,
Sean.