include: Add constants needed for SYSTEM_POWER_STATUS.

include/winbase.h

@@ -966,6 +966,24 @@ typedef struct _SYSTEM_POWER_STATUS
   DWORD   BatteryFullLifeTime;
 } SYSTEM_POWER_STATUS, *LPSYSTEM_POWER_STATUS;
 
+#define AC_LINE_OFFLINE         0x00
+#define AC_LINE_ONLINE          0x01
+#define AC_LINE_BACKUP_POWER    0x02
+#define AC_LINE_UNKNOWN         0xFF
+
+#define BATTERY_FLAG_HIGH           0x01
+#define BATTERY_FLAG_LOW            0x02
+#define BATTERY_FLAG_CRITICAL       0x04
+#define BATTERY_FLAG_CHARGING       0x08
+#define BATTERY_FLAG_NO_BATTERY     0x80
+#define BATTERY_FLAG_UNKNOWN        0xFF
+
+#define BATTERY_PERCENTAGE_UNKNOWN  0xFF
+
+#define SYSTEM_STATUS_FLAG_POWER_SAVING_ON  0x01
+
+#define BATTERY_LIFE_UNKNOWN 0xFFFFFFFF
+
 typedef struct _SYSTEM_INFO
 {
     union {