setup script improvements, automatically clone xmrig-hac and build for multiple platforms

libs/libsodium-1.0.18/src/libsodium/crypto_hash/sha256/hash_sha256.c

@@ -0,0 +1,13 @@
+#include "crypto_hash_sha256.h"
+
+size_t
+crypto_hash_sha256_bytes(void)
+{
+    return crypto_hash_sha256_BYTES;
+}
+
+size_t
+crypto_hash_sha256_statebytes(void)
+{
+    return sizeof(crypto_hash_sha256_state);
+}