Make libnosys function stubs part of libnacl

src/untrusted/nacl/stubs/_execve.c

Index: src/untrusted/nacl/stubs/_execve.c
diff --git a/src/untrusted/nosys/_execve.c b/src/untrusted/nacl/stubs/_execve.c
similarity index 83%
rename from src/untrusted/nosys/_execve.c
rename to src/untrusted/nacl/stubs/_execve.c
index 1b095780d6a3ef2711fa4eea7f74983fb3b84f33..faa6d9840ff2ed490ef0bbe0b17bf512080c1b0a 100644
--- a/src/untrusted/nosys/_execve.c
+++ b/src/untrusted/nacl/stubs/_execve.c
@@ -16,6 +16,3 @@ int _execve(const char *name, char * const argv[], char * const envp[]) {
   errno = ENOSYS;
   return -1;
 }
-
-#include "native_client/src/untrusted/nosys/warning.h"
-stub_warning(_execve);