Make v8 compile on VS2013.

src/platform.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 49 matching lines @@
 #endif
 
 // Microsoft Visual C++ specific stuff.
 #if V8_CC_MSVC
 
 #include "win32-headers.h"
 #include "win32-math.h"
 
 int strncasecmp(const char* s1, const char* s2, int n);
 
+// Visual C++ 2013 and higher implement this function.
+#if (_MSC_VER < 1800)
 inline int lrint(double flt) {
   int intgr;
 #if V8_TARGET_ARCH_IA32
   __asm {
     fld flt
     fistp intgr
   };
 #else
   intgr = static_cast<int>(flt + 0.5);
   if ((intgr & 1) != 0 && intgr - flt == 0.5) {
     // If the number is halfway between two integers, round to the even one.
     intgr--;
   }
 #endif
   return intgr;
 }
 
+#endif  // _MSC_VER < 1800
+
 #endif  // V8_CC_MSVC
 
 namespace v8 {
 namespace internal {
 
 double ceiling(double x);
 double modulo(double x, double y);
 
 // Custom implementation of math functions.
 double fast_sin(double input);
@@ skipping 491 matching lines @@
   char name_[kMaxThreadNameLength];
   int stack_size_;
   Semaphore* start_semaphore_;
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_