Log Message:
Update security/pam-ldap to version 176.  pkgsrc-related changes in this
update include:

	* The configuration file (shared with nss_ldap.so and sudo) has
	  been moved to ${PKG_SYSCONFDIR}/ldap.conf.  Any secrets file is
	  found in ${PKG_SYSCONFDIR}/ldap.secret.

	* Use the pkg.install framework to copy the config file from the
	  example directory to the real location.

	* Use libtool to build and install the PAM module.

Changes from version 150 include:

	* preliminary SASL bind support

	* include password policy schema file
	* preliminary support for
	  draft-behera-ldap-password-policy-07.txt

	* support for service-based authorization
	  (based on patch from Manon Goo)
	* add ignore_authinfo_unavail flag
	* pam_filter works again

	* fix from Thorsten Kukuk (SuSE) to handle scope-less
	  nss_base_passwd configuration

	* AD password change fix
	* fix from Thorsten Kukuk (SuSE) to handle aborted password changes
	* support for multiple service search descriptors from Symas

	* support non-experimental password change exop
	* patch from Howard Chu to use linker grouping on Solaris