Meson-git breaks build

[ms178]

Usign meson-git (1.3.0rc1.r13.2d538c58c), the build now fails early on with:

vkd3d-proton/libs/d3d12core/meson.build:15:16: ERROR: shared_library keyword argument "objects" File: "d3d12core.def" are not objects

A full log can be found at /tmp/makepkg/vkd3d-proton-mingw-git/src/build/x64/meson-logs/meson-log.txt
WARNING: Running the setup command as `meson [options]` instead of `meson setup [options]` is ambiguous and deprecated.

[ionenwks]

For the record this should be fixed on meson's end (will be in upcoming >=1.3.0rc3) to emit a deprecation warning instead, see mesonbuild/meson#12508

Not that the warning shouldn't be fixed here either way to avoid future issues.

[HansKristian-Work]

The suggested fix to use vs_module_def breaks the build since MinGW targets ignore that apparently. We cannot fix this as-is.

[eli-schwartz]

I was a bit afraid of that but I didn't have the toolchain to build this locally.

It's a confusing situation since it was silently allowed for source files but not permitted for custom_target outputs... We really should be consistent and allow both. Well actually we should fix vs_module_defs to work correctly.

[eli-schwartz]

(I wish I'd known about this mingw failure mode a long time ago.)