Make libnosys function stubs part of libnacl

src/untrusted/nacl/stubs/umask.c

Index: src/untrusted/nacl/stubs/umask.c
diff --git a/src/untrusted/nosys/umask.c b/src/untrusted/nacl/stubs/umask.c
similarity index 82%
rename from src/untrusted/nosys/umask.c
rename to src/untrusted/nacl/stubs/umask.c
index a156d8f99ed0991e739d579101aa09f8972dbff6..6d9bf487e58dc38633c83e8a49b2daeba7955b0d 100644
--- a/src/untrusted/nosys/umask.c
+++ b/src/untrusted/nacl/stubs/umask.c
@@ -17,6 +17,3 @@ mode_t umask(mode_t mask) {
   errno = ENOSYS;
   return 0777;
 }
-
-#include "native_client/src/untrusted/nosys/warning.h"
-stub_warning(umask);