Add a libc wrapper for statx(2).

Bug: http://b/127675384
Bug: http://b/146676114
Test: treehugger
Change-Id: I844edc12f62717e579870a040cf03dfe60dc280b
diff --git a/libc/libc.map.txt b/libc/libc.map.txt
index 37807be..4bfb8a2 100644
--- a/libc/libc.map.txt
+++ b/libc/libc.map.txt
@@ -1505,6 +1505,7 @@
     pthread_rwlock_clockwrlock;
     renameat2;
     sem_clockwait;
+    statx;
     thrd_create;
     thrd_current;
     thrd_detach;