Upgrade versions of vendored libs

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

@@ -13,10 +13,6 @@
  * You may select, at your option, one of the above-listed licenses.
 ****************************************************************** */
 
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
 #ifndef HUF_H_298734234
 #define HUF_H_298734234
 
@@ -26,7 +22,6 @@ extern "C" {
 #define FSE_STATIC_LINKING_ONLY
 #include "fse.h"
 
-
 /* ***   Tool functions *** */
 #define HUF_BLOCKSIZE_MAX (128 * 1024)   /**< maximum input size for a single block compressed with HUF_compress */
 size_t HUF_compressBound(size_t size);   /**< maximum compressed size (worst case) */
@@ -282,8 +277,4 @@ size_t HUF_readDTableX2_wksp(HUF_DTable* DTable, const void* src, size_t srcSize
 
 #endif   /* HUF_H_298734234 */
 
-#if defined (__cplusplus)
-}
-#endif
-
 #endif /* USE_EXTERNAL_ZSTD */