separate posix functionality to grpc_posix.h
diff --git a/grpc.def b/grpc.def
index b042a69..562ca51 100644
--- a/grpc.def
+++ b/grpc.def
@@ -89,6 +89,7 @@
     grpc_header_nonbin_value_is_legal
     grpc_is_binary_header
     grpc_call_error_to_string
+    grpc_insecure_channel_create_from_fd
     grpc_auth_property_iterator_next
     grpc_auth_context_property_iterator
     grpc_auth_context_peer_identity