A Java jar file is a zip file, but it can have a prefix that is a bash
script that unpacks the zip file. Most zip programs ignore such prefixes.
This CL changes the archive/zip package to do the same.
Fixes #10464
Fixes #51337
Change-Id: I976e9c64684644317bd21077bc5b4a2baf626ee6
Reviewed-on: https://go-review.googlesource.com/c/go/+/387976
Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
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Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Joseph Tsai <joetsai@digital-static.net>
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