revert dates to match those in actual release

(didn't move tags forward, so release had old dates)

CHANGES

 OpenLDAP 2.4 Change Log
 
-OpenLDAP 2.4.24 Release (2011/02/11)
+OpenLDAP 2.4.24 Release (2011/02/10)
 	Added LDIF line wrapping setting (ITS#6645)
 	Added MozNSS support (ITS#6714,ITS#6742,ITS#6790,ITS#6791)
 	Added MozNSS support (ITS#6802,ITS#6811,ITS#6816,ITS#5696)

build/version.var

@@ -20,4 +20,4 @@ ol_api_inc=20424
 ol_api_current=8
 ol_api_revision=0
 ol_api_age=6
-ol_release_date="2011/02/11"
+ol_release_date="2011/02/10"