(ITS#3439) EXTERNAL auth doesn't work on netbsd

[lha@kth.se]

Full_Name: Love Hörnquist åstrand
Version: openldap-2.2.18nb3
OS: netbsd
URL: http://people.su.se/~lha/patches/openldap/local-cred-netbsd.diff
Submission from: (NULL) (2001:6b0:1:1ed1:205:3cff:fe09:da08)


On netbsd cyrus sasl EXTERNAL auth doesn't work since
the code doesn't know how to extract the userid of
the peer on the other end of the PF_LOCAL socket.

Before:
: root@nutcracker ; ldapsearch -x -H ldapi:/// -b '' -s base ''
supportedSASLMechanisms | grep supportedSASLMechanisms
# requesting:  supportedSASLMechanisms 

After:

: root@nutcracker ; ldapsearch -x -H ldapi:/// -b '' -s base ''
supportedSASLMechanisms | grep supportedSASLMechanisms
# requesting:  supportedSASLMechanisms 
supportedSASLMechanisms: EXTERNAL


and they all rejoiced