build: Wayland scanner should generate private code.

[ceyusa]

wayland-scanner emits a warning:

Using "code" is deprecated - use private-code or public-code. See the help page for details.

This patch updates argument to private-code.

[evelikov]

The person who added private-code and public-code to wayland-scanner, here o/

Can we get this PR merged?

[evelikov]

@XinfengZhang @uartie humble ping?

[evelikov]

On second thought I think we need a couple of small tweaks:

• check for newer versions of wayland-scanner - anything recent/supported will have it installed, but configure/meson should check
• the export.c file (git grep for all references) with the symbol hack should be nuked

@ceyusa can you sort these out? Perhaps we'll see this merged before it's 1 year anniversary :-P

[dvrogozh]

On second thought I think we need a couple of small tweaks

@evelikov : do you consider these important to be done within this PR or this can be done in other PR? @ceyusa?

[ceyusa]

Yes, I can do it in a follow up PR.

[evelikov]

Upon closer look the meson wayland handling is tad busted on a number of levels. Will open a proper MR in a moment

[evelikov]

Superseded by https://github.com/intel/libva/pull/542

[dvrogozh]

Superseded by #542

You mean, by #627?

[dvrogozh]

Done with #627 (merged).