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/quirks/quirks.h

@@ -0,0 +1,34 @@
+
+#include <stdlib.h>
+
+/* C++Builder defines a "random" macro */
+#undef random
+
+#ifdef __EMSCRIPTEN__
+# define strcmp(s1, s2) xstrcmp(s1, s2)
+
+static int
+strcmp(const char *s1, const char *s2)
+{
+    while (*s1 == *s2++) {
+        if (*s1++ == 0) {
+            return 0;
+        }
+    }
+    return *(unsigned char *) s1 - *(unsigned char *) --s2;
+}
+#endif
+
+#ifdef _WIN32
+static void
+srandom(unsigned seed)
+{
+    srand(seed);
+}
+
+static long
+random(void)
+{
+    return (long) rand();
+}
+#endif