Add NBSD-like Minix system includes.

nbsd_include/sys/reboot.h

@@ -0,0 +1,13 @@
+#ifndef _SYS_REBOOT_H_
+#define _SYS_REBOOT_H_
+
+/* How to exit the system or stop a server process. */
+#define RBT_HALT	   0	/* shutdown and return to monitor */
+#define RBT_REBOOT	   1	/* reboot the system through the monitor */
+#define RBT_PANIC	   2	/* a server panics */
+#define RBT_MONITOR	   3	/* let the monitor do this */
+#define RBT_RESET	   4	/* hard reset the system */
+#define RBT_DEFAULT	   5	/* return to monitor, reset if not possible */
+#define RBT_INVALID	   6	/* first invalid reboot flag */
+
+#endif