Mark dowantarray() as deprecated

[ilmari]

This will make uses of the also-deprecated GIMME macro emit a compile-time warning.

Note that there are 3 modules still using GIMME in core, so this should not be merged until these are merged:

• #20138
• pmqs/Compress-Raw-Zlib#19
• pmqs/Compress-Raw-Bzip2#8

[jkeenan]

This will make uses of the also-deprecated GIMME macro emit a compile-time warning.

Note that there are 3 modules still using GIMME in core, so this should not be merged until these are merged:

* [Time-HiRes: use GIMME_V instead of the deprecated GIMME #20138](https://github.com/Perl/perl5/pull/20138)

* [Use GIMME_V instead of the deprecated GIMME pmqs/Compress-Raw-Zlib#19](https://github.com/pmqs/Compress-Raw-Zlib/pull/19)

* [Use GIMME_V instead of the deprecated GIMME pmqs/Compress-Raw-Bzip2#8](https://github.com/pmqs/Compress-Raw-Bzip2/pull/8)

Looks good to me, but ... we'll need new CPAN releases of Compress-Raw-Bzip2 and -Zlib which we can then synch into blead.

[jkeenan]

@ilmari, this pull request still needs review. Could you resolve the merge conflicts that have developed so that we can move the discussion forward.

Thank you very much.

[demerphq]

Conflicts resolved.

[demerphq]

@ilmari: Note all the patch links @jkeenan posted are applied. We should merge this once it passes CI.

[ilmari]

@demerphq The Compress-Raw-{Zlib,Bzip2} changes need to be released to CPAN and imported to blead before this can be merged.

[demerphq]

@ilmari acknowledged. Have you poked the owner to roll a release?

[demerphq]

@ilmari the modules have been released to CPAN by @pmqs. See https://github.com/pmqs/Compress-Raw-Zlib/pull/19 for conversation on this.