Remove unused LdapConn

Author: maikypedia

go/ql/src/experimental/CWE-287/ImproperLdapAuthCustomizations.qll

@@ -3,11 +3,6 @@ import DataFlow::PathGraph
 import semmle.go.dataflow.barrierguardutil.RegexpCheck
 
 module ImproperLdapAuth {
-  /**
-   * A LDAP connection node.
-   */
-  abstract class LdapConn extends DataFlow::CallNode { }
-
   /**
    * A sink that is vulnerable to improper LDAP Authentication vulnerabilities.
    */