Merge pull request #4350 from jbrazio/followup-a875861

Adds utility.h

Marlin/Marlin.h

 #include <avr/eeprom.h>
 #include <avr/interrupt.h>
 
-
 #include "fastio.h"
 #include "Configuration.h"
 #include "pins.h"
 
+#include "utility.h"
+
 #ifndef SANITYCHECK_H
   #error "Your Configuration.h and Configuration_adv.h files are outdated!"
 #endif
   #endif
 #endif
 
-void safe_delay(uint16_t del);
-
 #endif //MARLIN_H

Marlin/utility.h

+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+void safe_delay(uint16_t ms);