meson: Add dependency on genxml to anvil genfiles

This fixes a race condition where anv_gen_files are executed before
genxml files, which causes a build failure

v2: add dependency on idep_genxml (Lionel)

Fixes: d1992255bb
       ("meson: Add build Intel "anv" vulkan driver")

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/meson.build

@@ -105,7 +105,7 @@ foreach g : [['70', ['gen7_cmd_buffer.c']], ['75', ['gen7_cmd_buffer.c']],
       c_vis_args, no_override_init_args, c_sse2_args,
       '-DGEN_VERSIONx10=@0@'.format(_gen),
     ],
-    dependencies : [dep_libdrm, dep_valgrind, idep_nir_headers],
+    dependencies : [dep_libdrm, dep_valgrind, idep_nir_headers, idep_genxml],
   )
 endforeach