Update V8 to r5295 as required by WebKit r65615

Change-Id: I1d72d4990703e88b7798919c7a53e12ebf76958a
diff --git a/src/platform-posix.cc b/src/platform-posix.cc
index 89f4d98..c50d396 100644
--- a/src/platform-posix.cc
+++ b/src/platform-posix.cc
@@ -108,6 +108,11 @@
 }
 
 
+int OS::GetLastError() {
+  return errno;
+}
+
+
 // ----------------------------------------------------------------------------
 // POSIX stdio support.
 //
@@ -238,7 +243,7 @@
   addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
   addr.sin_port = htons(port);
   int status = bind(socket_,
-                    reinterpret_cast<struct sockaddr *>(&addr),
+                    BitCast<struct sockaddr *>(&addr),
                     sizeof(addr));
   return status == 0;
 }