Respect base virtual functions' signatures

src/debug.h

@@ -85,7 +85,7 @@ class Debugbuf : public std::streambuf
 		
 		return c;
 	}
-	int xsputn(const char *s, int n)
+	std::streamsize xsputn(const char *s, std::streamsize n)
 	{
 		for(int i=0; i<DEBUGSTREAM_COUNT; i++)
 		{

src/player.h

@@ -62,7 +62,7 @@ class Player
 		return m_position;
 	}
 
-	virtual void setPosition(v3f position)
+	virtual void setPosition(const v3f &position)
 	{
 		m_position = position;
 	}
@@ -206,7 +206,7 @@ class RemotePlayer : public Player, public scene::ISceneNode
 		return m_box;
 	}
 
-	void setPosition(v3f position)
+	void setPosition(const v3f &position)
 	{
 		m_oldpos = m_showpos;