Add libsodium to the tree and build what's needed from source.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3859 ed5197a5-7fde-0310-b194-c3ffbd925b24

deps/libsodium/test/default/hash3.c

@@ -0,0 +1,20 @@
+
+#define TEST_NAME "hash3"
+#include "cmptest.h"
+
+static unsigned char x[] = "testing\n";
+static unsigned char h[crypto_hash_BYTES];
+
+int
+main(void)
+{
+    size_t i;
+
+    crypto_hash(h, x, sizeof x - 1U);
+    for (i = 0; i < crypto_hash_BYTES; ++i) {
+        printf("%02x", (unsigned int) h[i]);
+    }
+    printf("\n");
+
+    return 0;
+}