[ECOS] new_net compilation failure

[Jani Monoses <jani at iv dot ro>]

now that sys/param.h includes errno.h which #defines errno
net/bsd_tcpip/src/sys/netinet/in_pcb.c won't build because some functions
have errno as a parameter name.That expands to the errno define and gives
several syntax errors.

I am just using the plain new_net template with no further config.

The solution would be either reverting the change and including errno.h only in the two files which needed
it or renaming the parameters.

the functions are in_rtchange & in_pcnbotifyall
Jani.

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