Introduce dart_sdk_lib_copy and make all sdk lib gypi files regular

runtime/bin/bin.gypi

 # Copyright (c) 2012, 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.
 
 {
   'variables': {
     'gen_source_dir': '<(SHARED_INTERMEDIATE_DIR)',
 
     'io_cc_file': '<(gen_source_dir)/io_gen.cc',
     'io_patch_cc_file': '<(gen_source_dir)/io_patch_gen.cc',
@@ skipping 44 matching lines @@
       ]
     },
     {
       'target_name': 'generate_io_cc_file',
       'type': 'none',
       'toolsets':['host'],
       'sources': [
         '../../sdk/lib/io/io.dart',
       ],
       'includes': [
-        '../../sdk/lib/io/iolib_sources.gypi',
+        '../../sdk/lib/io/io_sources.gypi',
       ],
       'actions': [
         {
           'action_name': 'generate_io_cc',
           'inputs': [
             '../tools/gen_library_src_paths.py',
             '<(builtin_in_cc_file)',
             '<@(_sources)',
           ],
           'outputs': [
@@ skipping 882 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }