Make libnosys function stubs part of libnacl

src/untrusted/nacl/stubs/pipe.c

Index: src/untrusted/nacl/stubs/pipe.c
diff --git a/src/untrusted/nosys/pipe.c b/src/untrusted/nacl/stubs/pipe.c
similarity index 81%
rename from src/untrusted/nosys/pipe.c
rename to src/untrusted/nacl/stubs/pipe.c
index ea4229a9577bcee28d0639ded26911c09f1f9b1b..70605b7bdd67ce9481a4206eaf64e93e2d28e032 100644
--- a/src/untrusted/nosys/pipe.c
+++ b/src/untrusted/nacl/stubs/pipe.c
@@ -16,6 +16,3 @@ int pipe(int fd[2]) {
   errno = ENOSYS;
   return -1;
 }
-
-#include "native_client/src/untrusted/nosys/warning.h"
-stub_warning(pipe);