Ticket 48834 - Fix jenkins: discared qualifier on auditlog.c

Bug Description:  ldap/servers/slapd/auditlog.c:87:31: warning: assignment
    discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
ldap/servers/slapd/auditlog.c:155:31: warning: assignment discards 'const'
    qualifier from pointer target type [-Wdiscarded-qualifiers]

Fix Description:  Add the const char type to the array.

https://fedorahosted.org/389/ticket/48834

Author: wibrown

Review by: One line fix

ldap/servers/slapd/auditlog.c

@@ -35,7 +35,7 @@ static int auditfail_hide_unhashed_pw = 1;
 /* Forward Declarations */
 static void write_audit_file(int logtype, int optype, const char *dn, void *change, int flag, time_t curtime, int rc );
 
-static char *modrdn_changes[4];
+static const char *modrdn_changes[4];
 
 void
 write_audit_log_entry( Slapi_PBlock *pb )