add fortified implementations of send/sendto

Bug: None
Test: Bullhead builds+boots; CtsBionicTestCases passes.
Change-Id: I2f137a100f679f7f2145d84b2f29ddd3e96a36ae
diff --git a/libc/libc.map.txt b/libc/libc.map.txt
index 46087e6..07dd63c 100644
--- a/libc/libc.map.txt
+++ b/libc/libc.map.txt
@@ -1290,6 +1290,7 @@
 
 LIBC_O {
   global:
+    __sendto_chk; # future
     __system_property_read_callback; # future
     bsd_signal; # arm x86 mips versioned=26
     catclose; # future