mesa: fix cross compilation

starting with 25.0.0, mesa no longer builds CLC executables when cross compiling:
it finds the `mesa-clc` & others we explicitly provide it, decides
there's no reason to build new versions of those components, and
so cross-compiled mesa no longer produces any `cross_tools` output.

excerpted from upstream src/compiler/clc/meson.build:

```meson
if get_option('mesa-clc') != 'system' and (with_gallium_asahi or \
                                           with_asahi_vk or \
                                           with_intel_vk or \
                                           with_gallium_iris or \
                                           get_option('install-mesa-clc'))
  prog_mesa_clc = executable(
    'mesa_clc',
    ['mesa_clc.c'],
    include_directories : [inc_include, inc_src],
    c_args : [pre_args, no_override_init_args],
    link_args : [ld_args_build_id],
    dependencies : [idep_mesaclc, dep_llvm, dep_spirv_tools, idep_getopt],
    # If we can run host binaries directly, just build mesa_clc for the host.
    # Most commonly this happens when doing a cross compile from an x86_64 build
    # machine to an x86 host
    native : not meson.can_run_host_binaries(),
    install : get_option('install-mesa-clc'),
  )
endif
```

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