Finally remove last old C style I/O stuff

Now I/O is fully done with C++ iostreams.

The only exception is in non-windows version
of Bioskey() in misc.cpp

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/main.cpp

@@ -21,7 +21,6 @@
 //// Includes
 ////
 
-#include <cstdlib>
 #include <iostream>
 
 #include "benchmark.h"
@@ -48,8 +47,6 @@ using std::string;
 int main(int argc, char *argv[]) {
 
   // Disable IO buffering
-  setbuf(stdin, NULL);
-  setbuf(stdout, NULL);
   std::cout.rdbuf()->pubsetbuf(NULL, 0);
   std::cin.rdbuf()->pubsetbuf(NULL, 0);
 

src/position.cpp

@@ -22,7 +22,6 @@
 ////
 
 #include <cassert>
-#include <cstdio>
 #include <iostream>
 #include <fstream>
 

src/search.cpp

@@ -22,7 +22,6 @@
 ////
 
 #include <cassert>
-#include <cstdio>
 #include <fstream>
 #include <iostream>
 #include <sstream>

src/square.cpp

@@ -22,7 +22,6 @@
 ////
 
 #include <cassert>
-#include <cstdio>
 #include <string>
 
 #include "square.h"