*** EFM32 branch ***

1. Remove "RT_USING_NETUTILS" defined in "rtconfig.h" to avoid compiling error
   - Warning: Due to the memory limitation, running lwIP on Gecko devices (EFM32G) is not properly tested.
   - Warning: To test lwIP, please revert the file, "components\net\lwip\src\arch\sys_arch.c", to revision 1620. There is a runtime error when working with the latest revision of that file. This error is currently under evaluation.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1623 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/efm32/rtconfig.h

@@ -190,7 +190,7 @@
 /* SECTION: lwip, a lighwight TCP/IP protocol stack */
 #if defined(EFM32_USING_ETHERNET)
 #define RT_USING_LWIP
-#define RT_USING_NETUTILS
+//#define RT_USING_NETUTILS
 //#define RT_LWIP_DHCP
 /* LwIP uses RT-Thread Memory Management */
 #define RT_LWIP_USING_RT_MEM