Import OpenLDAP 2.4.11.
Change from 2.4.9 relevant to our build:
Fixed liblber ber_get_next length decoding (ITS#5580)
Added libldap assertion control (ITS#5560)
Fixed libldap GnuTLS CRL result handling (ITS#5577)
Fixed libldap GnuTLS SSF computation (ITS#5585)
Fixed liblutil missing return code (ITS#5615)
Fixed libldap file descriptor leak with SELinux (ITS#5507)
Fixed libldap ld_defconn cleanup if it was freed (ITS#5518, ITS#5525)
Fixed libldap msgid handling (ITS#5318)
Fixed libldap t61 infinite loop (ITS#5542)
Fixed libldap_r missing stubs (ITS#5519)
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