Join the input thread without interrupting first

Otherwise we'll kill it before it finishes draining

src/InputStream.c

@@ -364,14 +364,12 @@ int stopInputStream(void) {
     // Signal the input send thread to drain all pending
     // input packets before shutting down.
     LbqSignalQueueDrain(&packetQueue);
+    PltJoinThread(&inputSendThread);
+    PltCloseThread(&inputSendThread);
 
     if (inputSock != INVALID_SOCKET) {
         shutdownTcpSocket(inputSock);
     }
-
-    PltInterruptThread(&inputSendThread);
-    PltJoinThread(&inputSendThread);
-    PltCloseThread(&inputSendThread);
     
     if (inputSock != INVALID_SOCKET) {
         closeSocket(inputSock);

src/Platform.c

@@ -167,7 +167,6 @@ void PltUnlockMutex(PLT_MUTEX* mutex) {
 }
 
 void PltJoinThread(PLT_THREAD* thread) {
-    LC_ASSERT(thread->cancelled);
 #if defined(LC_WINDOWS)
     WaitForSingleObjectEx(thread->handle, INFINITE, FALSE);
 #elif defined(__vita__)