Use --features wasm_simd rather than --copts -msimd128 for WAsm SIMD builds

PiperOrigin-RevId: 418847131
diff --git a/BUILD.bazel b/BUILD.bazel
index 3fc8139..1d48ba6 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -11979,7 +11979,7 @@
     values = {
         "crosstool_top": "@emsdk//emscripten_toolchain:everything",
         "cpu": "wasm",
-        "copt": "-msimd128",
+        "features": "wasm_simd",
     },
 )
 
@@ -11988,8 +11988,9 @@
     values = {
         "crosstool_top": "@emsdk//emscripten_toolchain:everything",
         "cpu": "wasm",
-        "copt": "-msimd128",
+        "features": "wasm_simd",
         "copt": "-mrelaxed-simd",
+        "linkopt": "-mrelaxed-simd",
     },
 )