Update vendored libs

vendor/github.com/DataDog/zstd/cpu.h

@@ -1,6 +1,5 @@
-#ifndef USE_EXTERNAL_ZSTD
 /*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * Copyright (c) 2018-present, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the
@@ -17,6 +16,8 @@
  * https://github.com/facebook/folly/blob/master/folly/CpuId.h
  */
 
+#include <string.h>
+
 #include "mem.h"
 
 #ifdef _MSC_VER
@@ -36,7 +37,6 @@ MEM_STATIC ZSTD_cpuid_t ZSTD_cpuid(void) {
     U32 f7b = 0;
     U32 f7c = 0;
 #if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_IX86))
-#if !defined(__clang__)
     int reg[4];
     __cpuid((int*)reg, 0);
     {
@@ -52,41 +52,6 @@ MEM_STATIC ZSTD_cpuid_t ZSTD_cpuid(void) {
             f7c = (U32)reg[2];
         }
     }
-#else
-    /* Clang compiler has a bug (fixed in https://reviews.llvm.org/D101338) in
-     * which the `__cpuid` intrinsic does not save and restore `rbx` as it needs
-     * to due to being a reserved register. So in that case, do the `cpuid`
-     * ourselves. Clang supports inline assembly anyway.
-     */
-    U32 n;
-    __asm__(
-        "pushq %%rbx\n\t"
-        "cpuid\n\t"
-        "popq %%rbx\n\t"
-        : "=a"(n)
-        : "a"(0)
-        : "rcx", "rdx");
-    if (n >= 1) {
-      U32 f1a;
-      __asm__(
-          "pushq %%rbx\n\t"
-          "cpuid\n\t"
-          "popq %%rbx\n\t"
-          : "=a"(f1a), "=c"(f1c), "=d"(f1d)
-          : "a"(1)
-          :);
-    }
-    if (n >= 7) {
-      __asm__(
-          "pushq %%rbx\n\t"
-          "cpuid\n\t"
-          "movq %%rbx, %%rax\n\t"
-          "popq %%rbx"
-          : "=a"(f7b), "=c"(f7c)
-          : "a"(7), "c"(0)
-          : "rdx");
-    }
-#endif
 #elif defined(__i386__) && defined(__PIC__) && !defined(__clang__) && defined(__GNUC__)
     /* The following block like the normal cpuid branch below, but gcc
      * reserves ebx for use of its pic register so we must specially
@@ -248,5 +213,3 @@ MEM_STATIC ZSTD_cpuid_t ZSTD_cpuid(void) {
 #undef X
 
 #endif /* ZSTD_COMMON_CPU_H */
-
-#endif /* USE_EXTERNAL_ZSTD */