[lwip-users] [lwip] NO_SYS

[Jani Monoses]

just a compiler warning
NO_SYS should be checked either with #ifdef or #if consistently

and lwipopt.h should have define NO_SYS or define NO_SYS 1
probably the latter and #if as the other opts are that way.

in these files

core/sys.c
include/lwip/sys.h

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