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
Fixes: d1992255 ("meson: Add build Intel "anv" vulkan driver")
This fixes a race condition where anv_gen_files are executed before genxml files, which causes a build failure
Fixes: d1992255 ("meson: Add build Intel "anv" vulkan driver")