Make libnosys function stubs part of libnacl

src/untrusted/nacl/stubs/vfork.c

Index: src/untrusted/nacl/stubs/vfork.c
diff --git a/src/untrusted/nosys/vfork.c b/src/untrusted/nacl/stubs/vfork.c
similarity index 82%
rename from src/untrusted/nosys/vfork.c
rename to src/untrusted/nacl/stubs/vfork.c
index daad1cc108642bfe554517a8ff703582943b2ffc..4a2844a3b6cf2db0af245e77910454c288a87012 100644
--- a/src/untrusted/nosys/vfork.c
+++ b/src/untrusted/nacl/stubs/vfork.c
@@ -17,6 +17,3 @@ pid_t vfork(void) {
   errno = ENOSYS;
   return -1;
 }
-
-#include "native_client/src/untrusted/nosys/warning.h"
-stub_warning(vfork);