Revert "mesa: drop iris/radeonsi/Vulkan drivers for greeter (need unported libclc)"

This reverts commit e1fc194c06.

local/recipes/libs/mesa/recipe.toml

@@ -91,14 +91,14 @@ cookbook_meson \
     -Degl=enabled \
     -Dgbm=enabled \
     -Dglx=disabled \
-    -Dgallium-drivers=softpipe,llvmpipe,virgl \
+    -Dgallium-drivers=softpipe,llvmpipe,virgl,iris,radeonsi \
     -Dllvm=enabled \
     -Dplatforms=wayland,redox \
     -Degl-native-platform=redox \
     -Dshader-cache=disabled \
     -Dc_args="['-include','alloca.h','-DCLOCK_MONOTONIC_RAW=(CLOCK_MONOTONIC+1000)','-Wno-error=implicit-function-declaration','-Wno-error=missing-prototypes','-Wno-error=return-type','-Wno-error=empty-body','-Wno-error=incompatible-pointer-types','-Wno-error=int-conversion','-Wno-error=format','-Wno-error','-std=gnu11','-Dstatic_assert=_Static_assert']" \
     -Dcpp_args="['-include','alloca.h','-Wno-error=implicit-function-declaration','-Wno-error=missing-prototypes','-Wno-error=return-type','-Wno-error=empty-body','-Wno-error=incompatible-pointer-types','-Wno-error=int-conversion','-Wno-error=format','-Wno-error']" \
-    -Dvulkan-drivers= \
+    -Dvulkan-drivers=intel,amd,swrast \
     -Dshared-glapi=enabled
 
 # Hack to add LLVM libs, the list can be seen from meson log and check for matches $("${LLVM_CONFIG}" --libs)