* mod_authnz_ldap: Allow using exec: callouts like SSLPassphraseDialog
for AuthLDAPBindPassword.
trunk patch: http://svn.apache.org/viewvc?view=revision&revision=1433478
+ http://svn.apache.org/viewvc?view=revision&revision=1467523
+ http://svn.apache.org/viewvc?view=revision&revision=1467792
2.2.x patch: http://people.apache.org/~druggeri/patches/AuthLDAPBindPasswordExec-2.2.patch
(20130119 - updated to include minor mmn bump)
(20130412 - updated to not use static var - thx, wrowe)