Update scummvm to 1.6.0, also make it a packaged app.

Makefile

 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 # Makefile
 #
 # usage: 'make [package]'
 #
 # This makefile builds all of the Native Client packages listed below
 # in $(PACKAGES). Each package has a dependency on its own sentinel
@@ skipping 256 matching lines @@
 $(SENT)/libraries/sqlite: libraries/readline
 $(SENT)/examples/games/nethack: libraries/ncurses libraries/libtar
 $(SENT)/examples/tools/bash: libraries/ncurses libraries/libtar
 $(SENT)/examples/editors/nano: libraries/ncurses libraries/libtar
 $(SENT)/examples/editors/vim: libraries/ncurses libraries/libtar
 $(SENT)/examples/tools/thttpd: libraries/jsoncpp
 $(SENT)/examples/tools/python_ppapi: libraries/python libraries/libtar
 $(SENT)/examples/tools/lua_ppapi: libraries/lua libraries/libtar
 $(SENT)/examples/tools/ruby_ppapi: \
     libraries/ruby libraries/libtar libraries/glibc-compat
-$(SENT)/examples/games/scummvm: \
-    libraries/nacl-mounts libraries/SDL libraries/libvorbis
+$(SENT)/examples/games/scummvm: libraries/SDL libraries/libvorbis \
+    libraries/libtar
 $(SENT)/examples/systems/bochs: \
     libraries/nacl-mounts libraries/SDL
 $(SENT)/examples/systems/dosbox: \
     libraries/nacl-mounts libraries/SDL libraries/zlib \
     libraries/libpng
 $(SENT)/examples/games/snes9x: libraries/nacl-mounts
 $(SENT)/examples/games/drod: libraries/SDL libraries/SDL_mixer \
     libraries/SDL_ttf libraries/zlib libraries/metakit libraries/libtar \
     libraries/expat
 $(SENT)/examples/graphics/mesagl: libraries/Mesa
@@ skipping 119 matching lines @@
 lua_ppapi: examples/tools/lua_ppapi ;
 python_ppapi: examples/tools/python_ppapi ;
 ruby_ppapi: examples/tools/ruby_ppapi ;
 scummvm: examples/games/scummvm ;
 snes9x: examples/games/snes9x ;
 thttpd: examples/tools/thttpd ;
 # Deliberate space after vim target to avoid detection
 # as modeline string.
 vim : examples/editors/vim ;
 xaos: examples/graphics/xaos ;