Support _FILE_OFFSET_BITS=64 for most of <stdio.h>.

This doesn't address funopen, but does add fgetpos/fsetpos/fseeko/ftello.

Bug: http://b/24807045
Change-Id: Ibff6f00df5fb699c8e8f13b91a75caf024540b73
diff --git a/libc/libc.arm64.map b/libc/libc.arm64.map
index e5933ae..a3308bd 100644
--- a/libc/libc.arm64.map
+++ b/libc/libc.arm64.map
@@ -1152,8 +1152,11 @@
     __pwrite_chk;
     __pwrite64_chk;
     __write_chk;
+    fgetpos64;
     fileno_unlocked;
     freeifaddrs;
+    fseeko64;
+    fsetpos64;
     getgrgid_r;
     getgrnam_r;
     getifaddrs;