Remove com.sun.jarsigner package with related options

[Eirik Bjørsnøs]

Hi,

The following PR suggests we remove the com.sun.jarsigner package with
related jarsigner options -altsigner and -altsignerpath options. These have
been deprecated since Java 9, for removal since 16:

https://github.com/openjdk/jdk/pull/12791

Thanks,
Eirik.
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