Fix missing global declarations in socket_unsupported.cc

runtime/bin/socket_unsupported.cc

Index: runtime/bin/socket_unsupported.cc
diff --git a/runtime/bin/socket_unsupported.cc b/runtime/bin/socket_unsupported.cc
index 089e48e8967f73e96a198e874139a6ede518a343..d3ecf1eade04693f561927134e9593b0f3e61b29 100644
--- a/runtime/bin/socket_unsupported.cc
+++ b/runtime/bin/socket_unsupported.cc
@@ -11,6 +11,10 @@
 namespace dart {
 namespace bin {
 
+bool short_socket_read = false;
+
+bool short_socket_write = false;
+
 void FUNCTION_NAME(InternetAddress_Parse)(Dart_NativeArguments args) {
   Dart_ThrowException(DartUtils::NewDartArgumentError(
       "Sockets unsupported on this platform"));