Update main.c

Fix warning: implicit declaration of function 'ioctl' [-Wimplicit-function-declaration] on "make" after "cmake"

main.c

@@ -1,7 +1,8 @@
 
 #include <stdio.h>
 #include <syslog.h>
-#include <fcntl.h>
+#include <sys/fcntl.h>
+#include <sys/ioctl.h>
 #include <linux/fb.h>
 #include <sys/mman.h>