Make libnosys function stubs part of libnacl

src/untrusted/nacl/stubs/signal.c

Index: src/untrusted/nacl/stubs/signal.c
diff --git a/src/untrusted/nosys/signal.c b/src/untrusted/nacl/stubs/signal.c
similarity index 82%
rename from src/untrusted/nosys/signal.c
rename to src/untrusted/nacl/stubs/signal.c
index aaca24735b61174d6fa8e0d5d82b276ca7129d18..ec109989062cceaaa51c65023a03d8180c782313 100644
--- a/src/untrusted/nosys/signal.c
+++ b/src/untrusted/nacl/stubs/signal.c
@@ -15,6 +15,3 @@ _sig_func_ptr signal(int sig, _sig_func_ptr handler) {
   errno = ENOSYS;
   return SIG_ERR;
 }
-
-#include "native_client/src/untrusted/nosys/warning.h"
-stub_warning(signal);