Support platform QNX OS

Compile with SDP7.1:
./configure --cc=aarch64-unknown-nto-qnx7.1.0-gcc --disable-shm
make

Function is verfied by UFS device read and write test.

server.c

@@ -2743,9 +2743,15 @@ static void set_sig_handlers(void)
  struct sigaction act = {
  .sa_handler = sig_int,
  #if defined(__QNX__)
+<<<<<<< HEAD
  act.sa_flags = SA_NOCLDSTOP,
  #else
  act.sa_flags = SA_RESTART,
+=======
+ .sa_flags = SA_NOCLDSTOP,
+ #else
+ .sa_flags = SA_RESTART,
+>>>>>>> Support platform QNX OS
  #endif
  };