Misc. portability fixes.

samples/shell.cc

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 #include <v8.h>
-#include <cstring>
-#include <cstdio>
-#include <cstdlib>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 
 void RunShell(v8::Handle<v8::Context> context);
 bool ExecuteString(v8::Handle<v8::String> source,
                    v8::Handle<v8::Value> name,
                    bool print_result,
                    bool report_exceptions);
 v8::Handle<v8::Value> Print(const v8::Arguments& args);
 v8::Handle<v8::Value> Load(const v8::Arguments& args);
 v8::Handle<v8::Value> Quit(const v8::Arguments& args);
@@ skipping 221 matching lines @@
     for (int i = 0; i < start; i++) {
       printf(" ");
     }
     int end = message->GetEndColumn();
     for (int i = start; i < end; i++) {
       printf("^");
     }
     printf("\n");
   }
 }