dropped some iostream dependencies

src/entry.cpp

@@ -33,8 +33,10 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "libtorrent/pch.hpp"
 
 #include <algorithm>
-#include <iostream>
+#if defined TORRENT_DEBUG && TORRENT_USE_IOSTREAM
 #include <iomanip>
+#include <iostream>
+#endif
 #include <boost/bind.hpp>
 #include "libtorrent/entry.hpp"
 #include "libtorrent/config.hpp"
@@ -353,6 +355,7 @@ namespace libtorrent
 		TORRENT_ASSERT(false);
 	}
 
+#if defined TORRENT_DEBUG && TORRENT_USE_IOSTREAM
 	void entry::print(std::ostream& os, int indent) const
 	{
 		TORRENT_ASSERT(indent >= 0);
@@ -415,5 +418,6 @@ namespace libtorrent
 			os << "<uninitialized>\n";
 		}
 	}
+#endif
 }