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

Change-Id: I81fde2ec9fdf787bb19a784ad13df92d33a4f852
diff --git a/libc/libc.mips64.map b/libc/libc.mips64.map
index 271460f..93bd94c 100644
--- a/libc/libc.mips64.map
+++ b/libc/libc.mips64.map
@@ -1147,6 +1147,8 @@
     __pwrite_chk;
     __pwrite64_chk;
     __write_chk;
+    adjtimex;
+    clock_adjtime;
     fgetpos64;
     fileno_unlocked;
     fopen64;