Really add adjtimex(2), and add clock_adjtime(2) too.

Change-Id: I81fde2ec9fdf787bb19a784ad13df92d33a4f852
diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index e045049..d5dd206 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -224,6 +224,7 @@
 int           timerfd_settime(int, int, const struct itimerspec*, struct itimerspec*)   all
 int           timerfd_gettime(int, struct itimerspec*)   all
 int           adjtimex(struct timex*)   all
+int           clock_adjtime(clockid_t, struct timex*)   all
 
 # signals
 int     __sigaction:sigaction(int, const struct sigaction*, struct sigaction*)  arm,mips,x86