Make libnosys function stubs part of libnacl

src/untrusted/nacl/stubs/system.c

Index: src/untrusted/nacl/stubs/system.c
diff --git a/src/untrusted/nosys/system.c b/src/untrusted/nacl/stubs/system.c
similarity index 81%
rename from src/untrusted/nosys/system.c
rename to src/untrusted/nacl/stubs/system.c
index 9675475dc3beddec813e6944f06b2a740c21a1d0..8f3880ac8f727815ee8811ee231b6bbeccd8fe75 100644
--- a/src/untrusted/nosys/system.c
+++ b/src/untrusted/nacl/stubs/system.c
@@ -15,6 +15,3 @@ int system(const char *command) {
   errno = ENOSYS;
   return -1;
 }
-
-#include "native_client/src/untrusted/nosys/warning.h"
-stub_warning(system);