lower case #defines

[Kendy Kutzner]

Hi,

from
linux-2.4.20_clickpatch/include/linux/icmpv6.h:

#define icmp6_identifier        icmp6_dataun.u_echo.identifier
#define icmp6_sequence          icmp6_dataun.u_echo.sequence


from 
click/include/clicknet/icmp6.h:

struct click_icmp6_sequenced {
....
    uint16_t icmp6_identifier;
    uint16_t icmp6_sequence;
};


For example while comiling click/elements/ip6/addresstranslator
for the linuxmodule, both get included.

Kendy
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