Add platform support for the 3DS

Prevent wildcard port binding on the 3DS
Add 3DS threading logic
Add 3DS socket logic
Bump the connection timeout to 60s for the 3DS

src/PlatformThreads.h

@@ -28,6 +28,13 @@ typedef struct _PLT_THREAD {
     OSThread thread;
     int cancelled;
 } PLT_THREAD;
+#elif defined(__3DS__)
+typedef LightLock PLT_MUTEX;
+typedef CondVar PLT_COND;
+typedef struct _PLT_THREAD {
+    Thread thread;
+    bool cancelled;
+} PLT_THREAD;
 #elif defined (LC_POSIX)
 typedef pthread_mutex_t PLT_MUTEX;
 typedef pthread_cond_t PLT_COND;