[NaCl SDK] Compile for naclio for Bionic

native_client_sdk/src/libraries/nacl_io/syscalls/signal.c

 /* Copyright 2013 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 #include "nacl_io/kernel_intercept.h"
 #include "nacl_io/kernel_wrap.h"
 
+#if !defined(__BIONIC__)
+
 sighandler_t signal(int signum, sighandler_t handler) {
   return ki_signal(signum, handler);
 }
+
+#else
+
+sighandler_t sysv_signal(int signum, sighandler_t handler)
+{
+  return ki_signal(signum, handler);
+}
+
+
+sighandler_t bsd_signal(int signum, sighandler_t handler) {
+  return ki_signal(signum, handler);
+}
+
+#endif /* #if !defined(__BIONIC_) */