Partial update of the NTP API, backported from commit eb4157390cac6212921ef198353635e138dc0a00

--- a/sysdeps/unix/sysv/linux/sys/timex.h
+++ b/sysdeps/unix/sysv/linux/sys/timex.h	
@@ -85,6 +85,8 @@
 #define MOD_TIMECONST	ADJ_TIMECONST
 #define MOD_CLKB	ADJ_TICK
 #define MOD_CLKA	ADJ_OFFSET_SINGLESHOT /* 0x8000 in original */
+#define MOD_MICRO	ADJ_MICRO
+#define MOD_NANO	ADJ_NANO
 
 
 /* Status codes (timex.status) */