add fortified implementations of pread/pread64

Change-Id: Iec39c3917e0bc94371bd81541619392f5abe29b9
diff --git a/libc/Android.mk b/libc/Android.mk
index e06a860..9d3b62a 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -71,6 +71,8 @@
     bionic/__fgets_chk.cpp \
     bionic/__memmove_chk.cpp \
     bionic/__poll_chk.cpp \
+    bionic/__pread64_chk.cpp \
+    bionic/__pread_chk.cpp \
     bionic/__read_chk.cpp \
     bionic/__recvfrom_chk.cpp \
     bionic/__stpcpy_chk.cpp \