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/builds/msvc/version.h

@@ -0,0 +1,32 @@
+
+#ifndef sodium_version_H
+#define sodium_version_H
+
+#include "export.h"
+
+#define SODIUM_VERSION_STRING "1.0.18"
+
+#define SODIUM_LIBRARY_VERSION_MAJOR 10
+#define SODIUM_LIBRARY_VERSION_MINOR 3
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+SODIUM_EXPORT
+const char *sodium_version_string(void);
+
+SODIUM_EXPORT
+int         sodium_library_version_major(void);
+
+SODIUM_EXPORT
+int         sodium_library_version_minor(void);
+
+SODIUM_EXPORT
+int         sodium_library_minimal(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif