Prep for release

CHANGES

 OpenLDAP 2.5 Change Log
 
-OpenLDAP 2.5.15 Engineering
+OpenLDAP 2.5.15 Release (2023/07/10)
 	Added libldap openssl3 support (ITS#9436, ITS#10030)
 	Fixed libldap handling of TCP KEEPALIVE options (ITS#10015)
 	Fixed libldap with async connections (ITS#10023)

build/version.var

@@ -15,9 +15,9 @@
 ol_package=OpenLDAP
 ol_major=2
 ol_minor=5
-ol_patch=X
-ol_api_inc=20514
+ol_patch=15
+ol_api_inc=20515
 ol_api_current=1
-ol_api_revision=9
+ol_api_revision=10
 ol_api_age=1
-ol_release_date="2023/02/08"
+ol_release_date="2023/07/10"