Unbreak build by making old MSVC happy (hopefully).

TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/386023002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22355 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ostreams.cc

@@ -5,6 +5,7 @@
 #include <algorithm>
 #include <cmath>
 
+#include "src/base/platform/platform.h"  // For isinf/isnan with MSVC
 #include "src/ostreams.h"
 
 #if V8_OS_WIN