[NaCl SDK] Make the SDK examples buildable as a packaged app.

native_client_sdk/src/examples/gamepad/example.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl', 'win', 'linux'],
   'TARGETS': [
     {
       'NAME' : 'gamepad',
       'TYPE' : 'main',
       'SOURCES' : ['gamepad.cc', 'gamepad_module.cc', 'gamepad.h'],
       'LIBS': ['ppapi_cpp', 'ppapi', 'pthread']
     }
   ],
   'DEST': 'examples',
   'NAME': 'gamepad',
   'TITLE': 'Gamepad Example.',
-  'DESC': """
-Attached gamepad values should appear, left to right, once they've been
-interacted with. Buttons, esp triggers are analog.
-""",
-  'FOCUS': 'Gamepad interface.',
   'GROUP': 'API'
 }