remove two lines to prevent crash during compile for the mbed frdm k64f

Dependencies:   Socket lwip-eth lwip-sys lwip

Fork of EthernetInterface by mbed official

Revision:
50:dd8331e55fea
Parent:
49:2fc406e2553f
Child:
53:318c1a0ad907
--- a/lwip-sys.lib	Thu Mar 12 16:58:57 2015 +0000
+++ b/lwip-sys.lib	Fri Oct 16 07:02:48 2015 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/lwip-sys/#7d4b24b58e04
+http://mbed.org/users/mbed_official/code/lwip-sys/#12e78a2462d0