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

native_client_sdk/src/examples/hello_nacl_io/example.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl', 'win'],
   'TARGETS': [
     {
       'NAME' : 'hello_nacl_io',
       'TYPE' : 'main',
       'SOURCES' : [
         'handlers.c',
         'handlers.h',
         'hello_nacl_io.c',
         'hello_nacl_io.h',
         'queue.c',
         'queue.h',
       ],
       'LIBS': ['ppapi', 'pthread', 'nacl_io']
     }
   ],
   'DATA': [
     'example.js'
   ],
   'DEST': 'examples',
   'NAME': 'hello_nacl_io',
   'TITLE': 'Hello, Nacl IO!',
-  'DESC': """
-The NaCl IO example demonstrates mapping standard FILE such as fopen,
-fread, fwrite into mounts by linking in the nacl_io library.  This allows
-developers to wrap Pepper API such as the File IO API or URL Loader into
-standard blocking calls.""",
-  'FOCUS': 'Using NaCl IO.',
   'GROUP': 'Concepts'
 }