Reland "Integrate SIMD optimisations for zlib"

third_party/zlib/simd_stub.c

+/* simd_stub.c -- stub implementations
+* Copyright (C) 2014 Intel Corporation
+* For conditions of distribution and use, see copyright notice in zlib.h
+*/
+#include <assert.h>
+
+#include "deflate.h"
+#include "x86.h"
+
+int x86_cpu_enable_simd;
+
+void ZLIB_INTERNAL crc_fold_init(deflate_state *const s) {
+    assert(0);
+}
+
+void ZLIB_INTERNAL crc_fold_copy(deflate_state *const s,
+                                 unsigned char *dst,
+                                 const unsigned char *src,
+                                 long len) {
+    assert(0);
+}
+
+unsigned ZLIB_INTERNAL crc_fold_512to32(deflate_state *const s) {
+    assert(0);
+    return 0;
+}
+
+void ZLIB_INTERNAL fill_window_sse(deflate_state *s)
+{
+    assert(0);
+}
+
+void x86_check_features(void)
+{
+}