Remove improper ifdef
diff --git a/binding.gyp b/binding.gyp
index 4046226..6c6b3cf 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -742,6 +742,7 @@
'src/core/ext/resolver/dns/c_ares/dns_resolver_ares.c',
'src/core/ext/resolver/dns/c_ares/grpc_ares_ev_driver_posix.c',
'src/core/ext/resolver/dns/c_ares/grpc_ares_wrapper.c',
+ 'src/core/ext/resolver/dns/c_ares/grpc_ares_wrapper_fallback.c',
'src/core/ext/resolver/dns/native/dns_resolver.c',
'src/core/ext/resolver/sockaddr/sockaddr_resolver.c',
'src/core/ext/load_reporting/load_reporting.c',