Add test running support for tests generated as pexes.

tests/barebones/nacl.scons

Index: tests/barebones/nacl.scons
diff --git a/tests/barebones/nacl.scons b/tests/barebones/nacl.scons
index 52a58cd07461d79d1a48584b8b536f8d851d9c1d..4333291c91ac41ee5ae9bebf8f914ab657c9f3bb 100644
--- a/tests/barebones/nacl.scons
+++ b/tests/barebones/nacl.scons
@@ -15,7 +15,8 @@ is_glibc = env.Bit('nacl_glibc')
 
 env.Replace(LIBS=[],
             EXTRA_LIBS=[],
-            LINKFLAGS=['-nostdlib'])
+            LINKFLAGS=['-nostdlib'],
+            TRANSLATEFLAGS=['-nostdlib'])
 
 # This setting will affect the barebones_regs.c test
 if env.Bit('build_arm'):