Match WAsm SIMD configuration by -msimd128 compiler flag

PiperOrigin-RevId: 313839310
diff --git a/BUILD.bazel b/BUILD.bazel
index e79afa4..af81d52 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -4470,7 +4470,7 @@
     values = {
         "crosstool_top": "//toolchain:emscripten",
         "cpu": "wasm",
-        "features": "wasm_simd",
+        "copt": "-msimd128",
     },
 )