RFR: 7903181: port jextract for foreign-preview changes [v3]

[Athijegannathan Sundararajan]

On Fri, 20 May 2022 13:20:39 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   using varargs with allocateArray calls with initial content (review comment)
>
> samples/libffmpeg/LibffmpegMain.java line 42:
> 
>> 40: import libffmpeg.AVStream;
>> 41: import static libffmpeg.Libffmpeg.*;
>> 42: import static java.lang.foreign.MemoryAddress.*;
> 
> Most of other samples statically import just NULL

Will fix with specific import

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PR: https://git.openjdk.java.net/jextract/pull/35