Don't need kbhit.h

sim/kbhit.h

@@ -1,39 +0,0 @@
-/*
-  kbhit.h - keyboard hit detection - used in serial port replacement for grbl sim
-
-  linux kbhit taken from http://cboard.cprogramming.com/c-programming/63166-kbhit-linux.html. 
-  By 'thanatos':http://cboard.cprogramming.com/member.php?u=380
-
-  Part of Grbl Simulator
-
-  Copyright (c) 2014 Adam Shelly
-
-  Grbl is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Grbl is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-//if linux
-#include <stdio.h>
-#include <termios.h>
-#include <unistd.h>
-
-int  kbhit(void);
-void enable_kbhit(int);
-
-
-//else
-//#include <conio.h>
-//#define enable_kbhit(e) 
-//#define kbhit _kbhit
-//endif
-