IPPROTO_IP is not a macro

[Sam Steingold <sds at gnu dot org>]

<http://www.opengroup.org/onlinepubs/009695399/basedefs/netinet/in.h.html>:
The <netinet/in.h> header shall define the following macros for use as
values of the level argument of getsockopt() and setsockopt():

IPPROTO_IP
    Internet protocol.
etc

cygwin defines these constants with enum, not #define, so one cannot use
#ifdef with them.
    
-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
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