Non-SFI mode: Implement nacl_irt_random only for nacl_helper_nonsfi.

src/untrusted/nacl/nacl.scons

Index: src/untrusted/nacl/nacl.scons
diff --git a/src/untrusted/nacl/nacl.scons b/src/untrusted/nacl/nacl.scons
index a9ae58774dff39b8b1b0e1174c2366091c7aa628..e8a0082f09466b31b8ede3abce7f58a663a196b6 100644
--- a/src/untrusted/nacl/nacl.scons
+++ b/src/untrusted/nacl/nacl.scons
@@ -188,12 +188,13 @@ env.AddHeaderToSdk(['nacl_list_mappings.h'])
 env.ComponentLibrary(
     'libnacl_list_mappings_private', ['list_mappings_private.c'])
 
-env.ComponentLibrary(
-    'libnacl_random_private',
-    [env.ComponentObject('irt_random',
-                         '${MAIN_DIR}/src/untrusted/irt/irt_random.c'),
-     env.ComponentObject('irt_nameservice',
-                         '${MAIN_DIR}/src/untrusted/irt/irt_nameservice.c')])
+if not env.Bit('posix') and not env.Bit('nonsfi_nacl'):
+  env.ComponentLibrary(
+      'libnacl_random_private',
+      [env.ComponentObject('irt_random',
+                           '${MAIN_DIR}/src/untrusted/irt/irt_random.c'),
+       env.ComponentObject('irt_nameservice',
+                           '${MAIN_DIR}/src/untrusted/irt/irt_nameservice.c')])
 
 
 imc_syscalls = [