RFR: 8265343: Update Debian-based cross-compilation recipes

[John Paul Adrian Glaubitz]

On Sun, 18 Apr 2021 17:33:56 GMT, John Paul Adrian Glaubitz <glaubitz at openjdk.org> wrote:

>> After [JDK-8257913](https://bugs.openjdk.java.net/browse/JDK-8257913), we do not need to set a whole lot of options for cross-compiled builds. Docs should be updated to reflect that fact. Also put in more configurations that are buildable with Debian ports: these build routinely at [builds.shipilev.net](https://builds.shipilev.net/openjdk-jdk/).
>> 
>> Maybe @glaubitz wants to chime in here too :)
>
> @shipilev Nice work. I'll have a go at testing this next week. I didn't get to look this week as I was busy with my dayjob.
> 
> In any case, I'm very happy to see build instructions for so many architectures :-). I should also try to push some more Debian patches upstream so that most cross-builds will work out of the box.

> @glaubitz Yes, please take a look if you can. If not, I'll integrate this as is.

Looks good to me. It should be noted that in some cases such as m68k additional patches may be required to fix alignment issues, but I wanted to get these upstreamed anyway.

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PR: https://git.openjdk.java.net/jdk/pull/3545