layer: Relax Meson requirement from 1.1 to 1.0

[smcv]

Meson 1.0 is an interesting target because it's the version provided by the Debian 12 stable release, and by Valve's Steam Runtime (version 2 and up), therefore indirectly by Proton. The only obvious use of a Meson 1.1 feature in layer/ is the meson.options name, which is easily avoided.

In particular, the layer can be successfully compiled in the Steam Runtime 3 'sniper' SDK container[1], using its backport of gcc 14:

$ sudo vi /etc/apt/sources.list    # add the sniper_beta suite
$ sudo apt install gcc-14-monolithic
$ CC=gcc-14 CXX=g++-14 meson setup _build-sniper
$ meson compile -C _build-sniper

[1] https://gitlab.steamos.cloud/steamrt/sniper/sdk

[smcv]

cc @ivyl

[smcv]

I haven't tested the resulting layer binary (I don't think I have the right hardware), but perhaps a Proton developer could do so?

[smcv]

I notice that the layer build is disabled in the Proton SDK CI job right now. The gcc-14 backport is still beta-only right now, but it's likely to be preinstalled in a future version of the sniper SDK, at which point a respin of the sniper-derived Proton SDK will probably have all the pieces to be able to build with the layer enabled.

[jp7677]

Thanks a lot for looking into the Proton requirements for building the layer! No objections from my side to relax the minimum meson version.

[Saancreed]

And here I thought the C++20 compiler requirement would be harder to satisfy 😅

Also no objections here, having the layer buildable with Proton SDK would be great.