Windows: Link library sources into gen_snapshot/dart_bootstrap

runtime/vm/globals.h

 // 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.
 
 #ifndef RUNTIME_VM_GLOBALS_H_
 #define RUNTIME_VM_GLOBALS_H_
 
 // This file contains global definitions for the VM library only. Anything that
 // is more globally useful should be added to 'vm/globals.h'.
 
@@ skipping 117 matching lines @@
 #define COPY_FP_REGISTER(fp) asm volatile("mov %0, r11" : "=r"(fp));
 #endif
 #elif defined(HOST_ARCH_ARM64)
 #define COPY_FP_REGISTER(fp) asm volatile("mov %0, x29" : "=r"(fp));
 #elif defined(HOST_ARCH_MIPS)
 #define COPY_FP_REGISTER(fp) asm volatile("move %0, $fp" : "=r"(fp));
 #else
 #error Unknown host architecture.
 #endif
 
-
 #endif  // !defined(TARGET_OS_WINDOWS))
 
-// Default value for flag --use-corelib-source-files.
-#if defined(TARGET_OS_WINDOWS)
-static const bool kDefaultCorelibSourceFlag = true;
-#else
-static const bool kDefaultCorelibSourceFlag = false;
-#endif  // defined(TARGET_OS_WINDOWS)
-
 }  // namespace dart
 
 #endif  // RUNTIME_VM_GLOBALS_H_