NaCl: Fix nacl_io library to build with -Wstrict-prototypes

native_client_sdk/src/libraries/nacl_io/kernel_intercept.h

 /* Copyright (c) 2012 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. */
 
 #ifndef LIBRARIES_NACL_IO_KERNEL_INTERCEPT_H_
 #define LIBRARIES_NACL_IO_KERNEL_INTERCEPT_H_
 
 #include <stdarg.h>
 #include <sys/time.h>
 
@@ skipping 28 matching lines @@
  * with NULL will instantiate a default kernel proxy object.  ki_init must
  * be called before any other ki_XXX function can be used.
  */
 int ki_init(void* kernel_proxy);
 
 /*
  * Saves the current internal state.  This is used by test code which can
  * use this to save the current state before calling ki_init().  The
  * pushed state is restored in the next call to ki_uninit().
  */
-int ki_push_state_for_testing();
+int ki_push_state_for_testing(void);
 
 int ki_init_ppapi(void* kernel_proxy,
                   PP_Instance instance,
                   PPB_GetInterface get_browser_interface);
 
 /*
  * ki_init_interface() is a variant of ki_init() that can be called with
  * a PepperInterface object.
  */
 int ki_init_interface(void* kernel_proxy, void* pepper_interface);
 
 #ifdef __cplusplus
 nacl_io::KernelProxy* ki_get_proxy();
 #endif
 
-int ki_is_initialized();
-void ki_uninit();
+int ki_is_initialized(void);
+void ki_uninit(void);
 
 int ki_chdir(const char* path);
 void ki_exit(int status);
 char* ki_getcwd(char* buf, size_t size);
 char* ki_getwd(char* buf);
 int ki_dup(int oldfd);
 int ki_dup2(int oldfd, int newfd);
 int ki_chmod(const char* path, mode_t mode);
 int ki_fchdir(int fd);
 int ki_fchmod(int fd, mode_t mode);
@@ skipping 101 matching lines @@
                   const void* optval,
                   socklen_t len);
 int ki_shutdown(int fd, int how);
 int ki_socket(int domain, int type, int protocol);
 int ki_socketpair(int domain, int type, int protocl, int* sv);
 #endif  /* PROVIDES_SOCKET_API */
 
 EXTERN_C_END
 
 #endif  /* LIBRARIES_NACL_IO_KERNEL_INTERCEPT_H_ */