inet_aton configure test gets wrong result (ITS#1263)

[pbelbin@splitrock.net]

Full_Name: Peter Belbin
Version: 2.0.11
OS: SunOS 5.6
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (209.156.190.95)


It appears that using SunOS 5.6, the configure test for whether the system has
support for inet_aton arrives at the wrong conclusion.

The compiler does not appear to complain, but, when linking, it fails.

I have done a search of all the .h files I can, and find no declaration for the
inet_aton function anywhere.