(fixes a nasty configure spew on FreeBSD, reported by flashback).
Add check for sys/socket.h, replace unused checks for netinet/in_systm.h and
sys/in_system.h with a check for netinet/in.h. Remove unused check for
sys/syslimits.h.
git-svn-id: svn://svn.code.sf.net/p/bitchx/code/trunk@168 13b04d17-f746-0410-82c6-800466cd88b0
(Applies FreeBSD 9 build fix from rev 152 to configure). May also fix
strlcpy() detection with icc.
git-svn-id: svn://svn.code.sf.net/p/bitchx/code/trunk@154 13b04d17-f746-0410-82c6-800466cd88b0