Stub out pnacl-opt and pnacl-finalize tools for scons built_elsewhere=1

This is required to make the PSO generation test pass on ARM hardware;
(or more specifically, opt will run on the x86 bot, and get stubbed
out on the hardware bot). Stubbing out pnacl-finalize isn't
required for that particular test but is just for completeness.
R=mseaborn@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3873

Review URL: https://codereview.chromium.org/388573005

git-svn-id: svn://svn.chromium.org/native_client/trunk/src/native_client/site_scons@13469 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2
diff --git a/site_tools/naclsdk.py b/site_tools/naclsdk.py
index 0cce6d1..2208d6d 100755
--- a/site_tools/naclsdk.py
+++ b/site_tools/naclsdk.py
@@ -55,7 +55,7 @@
   assert(env.Bit('built_elsewhere'))
   env.Replace(CC='true', CXX='true', LINK='true', AR='true',
               RANLIB='true', AS='true', ASPP='true', LD='true',
-              STRIP='true')
+              STRIP='true', PNACLOPT='true', PNACLFINALIZE='true')
 
 
 def _SetEnvForNativeSdk(env, sdk_path):