Exclude wrap_memcpy.cc from BUILD.gn unconditionally

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index d9b5a483f622e1615aa4432d544b7be5adf54f94..99bc8572f772996c9035ce6b18d2095ba3a2751a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -139,13 +139,11 @@ source_set("gpr") {
     "src/core/lib/support/tmpfile_windows.c",
     "src/core/lib/support/wrap_memcpy.c",
   ]
-  if (is_android) {
-    # gRPC memcpy wrapping logic isn't Android-friendly.
-    # See https://crbug.com/661171
-    sources -= [
-      "src/core/lib/support/wrap_memcpy.c",
-    ]
-  }
+  # gRPC memcpy wrapping logic isn't useful here.
+  # See https://crbug.com/661171
+  sources -= [
+    "src/core/lib/support/wrap_memcpy.c",
+  ]
   deps = [
   ]
   configs -= [ "//build/config/compiler:chromium_code" ]