openldap: do not strip during install

Before:
WARNING: File '/usr/lib/openldap/slapd' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapsearch' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapmodify' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapdelete' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapmodrdn' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldappasswd' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapwhoami' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapcompare' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapexop' from openldap was already stripped, this will prevent future debugging!
WARNING: File '/usr/bin/ldapurl' from openldap was already stripped, this will prevent future debugging!

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>