Don't require inet_aton() (ITS#244)

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: HEAD
OS: Solaris
URL: 
Submission from: (NULL) (129.240.186.42)
Submitted by: hallvard


Compilation on solaris fails because solaris lacks inet_aton(),
which was introduced in slapd/daemon.c revision 1.90.