tu: Fixes missing sse2 flags

Turnip when cross-compiled for i386 needs to be built with SSE2 as a
minimum spec, as it uses clflush unconditionally. Make sure to pass in
the sse2_args, which will be empty on Arm64 targets.

Fixes: 7231eef630
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35621>

src/freedreno/vulkan/meson.build

@@ -61,7 +61,7 @@ libtu_includes = [
 
 tu_link_with = []
 tu_deps = []
-tu_flags = []
+tu_flags = [sse2_args]
 
 tu_wsi = false