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

native_client_sdk/src/libraries/nacl_io/kernel_intercept.h

Index: native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h b/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
index e75deb5e16426830d0908d2aaa927fa1c63e9c90..7cc2f832a66f75c5bb1d13078493b4989c4e428b 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_intercept.h
@@ -46,7 +46,7 @@ int ki_init(void* kernel_proxy);
  * 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,
@@ -62,8 +62,8 @@ int ki_init_interface(void* kernel_proxy, void* pepper_interface);
 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);