VM: Separate precompilation-specific code, make flags const.

runtime/dart-runtime.gyp

 # 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.
 
 {
   'includes': [
     'tools/gyp/runtime-configurations.gypi',
     'vm/vm.gypi',
     'observatory/observatory.gypi',
     'bin/bin.gypi',
@@ skipping 77 matching lines @@
       'direct_dependent_settings': {
         'include_dirs': [
           'include',
         ],
       },
     },
     {
       'target_name': 'libdart_precompiled_runtime',
       'type': 'static_library',
       'dependencies': [
-        'libdart_lib',
+        'libdart_lib_precompiled_runtime',
         'libdart_vm_precompiled_runtime',
         'libdouble_conversion',
         'generate_version_cc_file#host',
       ],
       'include_dirs': [
         '.',
       ],
       'sources': [
         'include/dart_api.h',
         'include/dart_mirrors_api.h',
@@ skipping 118 matching lines @@
         }],
         ['OS=="linux"', {
           'cflags': [
             '-fPIC',
           ],
         }],
       ],
     },
   ],
 }