fixed XXH64_finalize() not being inlined

even though `XXH_INLINE_ALL` is set
on `gcc-11`.

xxhash.h

@@ -3458,7 +3458,7 @@ static xxh_u64 XXH64_avalanche(xxh_u64 hash)
  * @return The finalized hash
  * @see XXH32_finalize().
  */
-static XXH_PUREF xxh_u64
+XXH_FORCE_INLINE XXH_PUREF xxh_u64
 XXH64_finalize(xxh_u64 hash, const xxh_u8* ptr, size_t len, XXH_alignment align)
 {
     if (ptr==NULL) XXH_ASSERT(len == 0);