win: build fixes

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 18cf816397c05839f3f2d76f981fa95e0ee42a36..923e8ebc174ed8e9925566cedf9fffb22b6620ea 100644
--- a/third_party/zlib/BUILD.gn
+++ b/third_party/zlib/BUILD.gn
@@ -7,12 +7,15 @@ config("zlib_config") {
 }
 
 static_library("zlib_x86_simd") {
-  if (cpu_arch == "x86" || cpu_arch == "x64") {
+  if (!is_win && (cpu_arch == "x86" || cpu_arch == "x64")) {
     sources = [ "crc_folding.c", "fill_window_sse.c" ]
     cflags = [ "-msse2", "-msse4.2", "-mpclmul" ]
   } else {
     sources = [ "simd_stub.c"]
   }
+  if (is_win) {
+    cflags = [ "/wd4324" ]
+  }
 }
 
 static_library("zlib") {
@@ -52,7 +55,7 @@ static_library("zlib") {
     "zutil.h",
   ]
 
-  if (cpu_arch == "x86" || cpu_arch == "x64") {
+  if (!is_win && (cpu_arch == "x86" || cpu_arch == "x64")) {
     sources += [ "x86.c" ]
   }