Kernel & LibC: Add CLOCK_REALTIME constant

Kernel/UnixTypes.h

@@ -466,6 +466,7 @@ typedef enum {
 
 typedef int clockid_t;
 
+#define CLOCK_REALTIME 0
 #define CLOCK_MONOTONIC 1
 #define TIMER_ABSTIME 99
 

Libraries/LibC/time.h

@@ -69,6 +69,7 @@ struct timespec {
 
 typedef int clockid_t;
 
+#define CLOCK_REALTIME 0
 #define CLOCK_MONOTONIC 1
 #define TIMER_ABSTIME 99