Added XXHash3

src/KKdLib/hash.cpp

@@ -4,6 +4,9 @@
 */
 
 #include "hash.hpp"
+#define XXH_STATIC_LINKING_ONLY
+#define XXH_IMPLEMENTATION
+#include <xxhash.h>
 
 static const uint16_t hash_crc16_ccitt_table[] = {
     0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
@@ -223,3 +226,7 @@ uint16_t hash_crc16_ccitt(const void* data, size_t size, bool make_upper) {
             hash = (uint16_t)(hash_crc16_ccitt_table[(hash >> 8) ^ *d++] ^ (hash << 8));
     return hash;
 }
+
+uint64_t hash_xxh3_64bits(const void* data, size_t size) {
+    return XXH3_64bits(data, size);
+}