Fix FreeBSD build.

Fix the following build error:

    ../deps/v8/src/compiler/graph-visualizer.h:23:1:
    error: 'FILE' does not name a type

See https://github.com/iojs/io.js/issues/1637 for background.

BUG=v8:4079
LOG=N

Review URL: https://codereview.chromium.org/1128053002

Cr-Commit-Position: refs/heads/master@{#28254}

src/compiler/graph-visualizer.h

@@ -5,6 +5,7 @@
 #ifndef V8_COMPILER_GRAPH_VISUALIZER_H_
 #define V8_COMPILER_GRAPH_VISUALIZER_H_
 
+#include <stdio.h>
 #include <iosfwd>
 
 namespace v8 {