deadlock fix.

shutdown both read and write of the socket to prevent
the reader blocks on read(2) but letting him able to
read pending packets.

foudn when `disconnect` where called and no more packets
are in the socket queue, the reader thread is kept in WAIT
state blocking `stop_reader` function on `pthread_join`.

Author: tux-mind

cSploitClient/connection.c

@@ -153,7 +153,7 @@ void disconnect_unix(JNIEnv *env, jclass clazz _U_) {
   stop_notifier();
 
   pthread_mutex_lock(&write_lock);
-  shutdown(sockfd, SHUT_WR);
+  shutdown(sockfd, SHUT_RDWR);
   pthread_mutex_unlock(&write_lock);
 
   stop_reader();