Add a netcontext variant of gethostbyaddr

Bug: 34953048
Test: Integration tests pass
Change-Id: Id04830345be56cd7a077981c6e2acfb5568e7a88
diff --git a/libc/libc.arm64.map b/libc/libc.arm64.map
index 34b8b19..cd1aff6 100644
--- a/libc/libc.arm64.map
+++ b/libc/libc.arm64.map
@@ -1242,6 +1242,7 @@
     android_getaddrinfofornet;
     android_getaddrinfofornetcontext;
     android_gethostbyaddrfornet;
+    android_gethostbyaddrfornetcontext;
     android_gethostbynamefornet;
     free_malloc_leak_info;
     get_malloc_leak_info;