Update from https://crrev.com/304715

third_party/zlib/BUILD.gn

Index: third_party/zlib/BUILD.gn
diff --git a/third_party/zlib/BUILD.gn b/third_party/zlib/BUILD.gn
index d07fd9a38706fb126d934db85429c42fcc3180dc..810fbb7455dfab428ba9cc049406ba5e39d6c275 100644
--- a/third_party/zlib/BUILD.gn
+++ b/third_party/zlib/BUILD.gn
@@ -7,9 +7,11 @@ config("zlib_config") {
 }
 
 static_library("zlib_x86_simd") {
-  if (!is_win && (cpu_arch == "x86" || cpu_arch == "x64")) {
+  if (!is_ios && (cpu_arch == "x86" || cpu_arch == "x64")) {
     sources = [ "crc_folding.c", "fill_window_sse.c" ]
-    cflags = [ "-msse2", "-msse4.2", "-mpclmul" ]
+    if (!is_win || is_clang) {
+      cflags = [ "-msse4.2", "-mpclmul" ]
+    }
   } else {
     sources = [ "simd_stub.c"]
   }