Dirk Ziegelmeier a1df0c5d77 Fix build failue in err.h reported by Axel Lin
In file included from ../../../../lwip/src/include/lwip/sockets.h:49:0,
                 from ../../../../lwip/src/core/init.c:47:
../../../../lwip/src/include/lwip/errno.h:46:5: error:
"LWIP_PROVIDE_ERRNO" is not defined [-Werror=undef]
 #if LWIP_PROVIDE_ERRNO
     ^~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
../Common.mk:93: recipe for target 'init.o' failed
make: *** [init.o] Error 1
2017-01-31 08:57:25 +01:00
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