esp8266: Enable modlwip.
diff --git a/esp8266/esp8266.ld b/esp8266/esp8266.ld
index 8f55ab1..f501fb8 100644
--- a/esp8266/esp8266.ld
+++ b/esp8266/esp8266.ld
@@ -94,6 +94,7 @@
         *modnetwork.o(.literal* .text*)
         *moduos.o(.literal* .text*)
         *modutime.o(.literal* .text*)
+        *modlwip.o(.literal* .text*)
 
         /* we put as much rodata as possible in this section */
         /* note that only rodata accessed as a machine word is allowed here */