This has been superseded by both dev-php/PEAR-Net_LDAP2 and dev-php/PEAR-Net_LDAP3. Nothing in the tree needs it.
commit d499be53f4d52ca84d838c563ad9f8aaf46ba923 Author: Michael Orlitzky <mjo@gentoo.org> Date: Tue Mar 14 11:32:18 2017 -0400 dev-php/PEAR-Net_LDAP: remove masked package. Gentoo-Bug: 609142