(ITS#6567) Enable GSSAPI support and expose ldap_gssadpi_bind_s

[ssalley@likewise.com]

Full_Name: Scott Salley
Version: HEAD
OS: Linux
URL: http://archives.likewiseopen.org/~ssalley/OpenLDAP/scott-salley-100601-define-have-gssapi.patch
Submission from: (NULL) (67.51.54.234)


Note that a similar issue/contribution was submitted in 2008 (Contrib/5369) and
appears to have been 'lost'.

The patch http://archives.likewiseopen.org/~ssalley/OpenLDAP/scott-salley-100601-define-have-gssapi.patch
makes it possible to use the GSSAPI support in OpenLDAP by:

1. Defining --with-gssapi in configure which
 a. Checks for appropriate header files
 b. Checks for the appropriate library
 c. Defines HAVE_GSSAPI to 1 in everything is in order

2. Exposing ldap_gssapi_bind_s in ldap.h