Refactor the gypi files to eliminate some redundancy.

bin/bin_sources.gypi

Index: bin/bin_sources.gypi
===================================================================
--- bin/bin_sources.gypi	(revision 0)
+++ bin/bin_sources.gypi	(revision 0)
@@ -0,0 +1,51 @@
+# Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+# This file contains all sources (vm and tests) for the dart virtual machine.
+# Unit test files need to have a '_test' suffix appended to the name.
+{
+  'sources': [
+    'dartutils.cc',
+    'dartutils.h',
+    'directory.cc',
+    'directory.h',
+    'directory_posix.cc',
+    'directory_win.cc',
+    'eventhandler.cc',
+    'eventhandler.h',
+    'eventhandler_linux.cc',
+    'eventhandler_linux.h',
+    'eventhandler_macos.cc',
+    'eventhandler_macos.h',
+    'eventhandler_win.cc',
+    'eventhandler_win.h',
+    'file.cc',
+    'file.h',
+    'file_linux.cc',
+    'file_macos.cc',
+    'file_win.cc',
+    'file_test.cc',
+    'fdutils.h',
+    'fdutils_linux.cc',
+    'fdutils_macos.cc',
+    'globals.h',
+    'platform.cc',
+    'platform.h',
+    'platform_linux.cc',
+    'platform_macos.cc',
+    'platform_win.cc',
+    'process.cc',
+    'process.h',
+    'process_linux.cc',
+    'process_macos.cc',
+    'process_win.cc',
+    'socket.cc',
+    'socket.h',
+    'socket_linux.cc',
+    'socket_macos.cc',
+    'socket_win.cc',
+    'set.h',
+    'set_test.cc',
+  ],
+}