Remove __amd64__ since other 64bit systems like aarch64 support this

src/komodo_curve25519.h

@@ -1,3 +1,4 @@
+// Copyright (c) 2019-2020 The Hush developers
 /******************************************************************************
  * Copyright © 2014-2019 The SuperNET Developers.                             *
  *                                                                            *
@@ -81,7 +82,7 @@ bits320 fexpand(bits256 basepoint)
     return(out);
 }
 
-#if __amd64__
+//#if __amd64__
 // donna: special gcc mode for 128-bit integers. It's implemented on 64-bit platforms only as far as I know.
 typedef unsigned uint128_t __attribute__((mode(TI)));
 
@@ -1010,4 +1011,4 @@ int32_t komodo_kvsigverify(uint8_t *buf,int32_t len,uint256 _pubkey,uint256 sig)
     return(0);
 }
 
-#endif
+//#endif