Slapd uses mdb as backend database. Only enable mdb for the built in test suite.
Patch was developed in-house; it is Solaris specific and
will not be contributed upstream.

--- openldap-2.4.44/tests/Makefile.in.old	Mon Nov 16 15:38:20 2015
+++ openldap-2.4.44/tests/Makefile.in	Mon Nov 16 15:38:27 2015
@@ -23,8 +23,6 @@
 
 # test primary backends (default)
 test tests:
-	@$(MAKE) bdb
-	@$(MAKE) hdb
 	@$(MAKE) mdb
 
 # test all backends