fortify: add __mempcpy_chk

Bug: 131861088
Test: mma + bionic-unit-tests on blueline
Change-Id: I02f8f87d5db0ba5fecec410da32f6ffa2c98ef57
diff --git a/libc/libc.map.txt b/libc/libc.map.txt
index b12df56..3c23da2 100644
--- a/libc/libc.map.txt
+++ b/libc/libc.map.txt
@@ -1482,6 +1482,7 @@
 
 LIBC_R { # introduced=R
   global:
+    __mempcpy_chk;
     __open64_2;
     __openat64_2;
     call_once;