added simple guard macros

in case of accidental multi-includes

lib/decompress/zstd_ddict.h

@@ -8,6 +8,10 @@
  * You may select, at your option, one of the above-listed licenses.
  */
 
+
+#ifndef ZSTD_DDICT_H
+#define ZSTD_DDICT_H
+
 /*-*******************************************************
  *  Dependencies
  *********************************************************/
@@ -23,3 +27,6 @@ const void* ZSTD_DDict_dictContent(const ZSTD_DDict* ddict);
 size_t ZSTD_DDict_dictSize(const ZSTD_DDict* ddict);
 
 void ZSTD_copyDDictParameters(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict);
+
+
+#endif /* ZSTD_DDICT_H */

lib/decompress/zstd_decompress_internal.h

@@ -12,6 +12,9 @@
 /* zstd_decompress_internal:
  * objects and definitions shared within lib/decompress modules */
 
+ #ifndef ZSTD_DECOMPRESS_INTERNAL_H
+ #define ZSTD_DECOMPRESS_INTERNAL_H
+
 
 /*-*******************************************************
  *  Dependencies
@@ -115,3 +118,6 @@ struct ZSTD_DCtx_s
   * @return : size of entropy tables read */
  size_t ZSTD_loadDEntropy(ZSTD_entropyDTables_t* entropy,
                     const void* const dict, size_t const dictSize);
+
+
+#endif /* ZSTD_DECOMPRESS_INTERNAL_H */