openldap: added libdb component for cygwin + explicit dependency

component/openldap/buildout.cfg

@@ -5,6 +5,7 @@ extends =
   ../groff/buildout.cfg
   ../openssl/buildout.cfg
   ../cyrus-sasl/buildout.cfg
+  ../libdb/buildout.cfg
 
 [openldap]
 recipe = slapos.recipe.cmmi
@@ -35,6 +36,7 @@ promises =
   /usr/include/ldap.h
 url = ftp://lug.mtu.edu/cygwin/x86/release/openldap/openldap-2.3.43-3-src.tar.bz2
 md5sum = 534265a210652f355da30aaf2a97b96f
+dependency-libdb = ${libdb:recipe}
 configure-command = cygport
 configure-options =
   openldap-2.3.43-3.cygport