Feature/port avr build check (#35)

* fix atmega168 build.

* remove time.h to solve AVR compile

* Add AVR build to CI for compile check

src/bacnet/basic/sys/mstimer.c

@@ -20,7 +20,6 @@
 #include <stdio.h>
 #include <stdbool.h>
 #include <stdint.h>
-#include <time.h>
 #include "mstimer.h"
 
 /**
@@ -83,12 +82,12 @@ void mstimer_restart(struct mstimer *t)
  * @return Non-zero if the timer has expired, zero otherwise.
  */
 int mstimer_expired(struct mstimer *t)
-{ 
+{
     if (t->interval) {
         return ((unsigned long)((mstimer_now()) - (t->start + t->interval)) <
             ((unsigned long)(~((unsigned long)0)) >> 1));
     }
-    
+
     return 0;
 }
 /*---------------------------------------------------------------------------*/