LDAP: fix bug 2919463, escape quotes in search filter

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@896 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/ldap/LdapConnection.java

@@ -1045,7 +1045,7 @@ public class LdapConnection extends AbstractConnection {
                 if (mode == LDAP_SUBSTRING_FINAL || mode == LDAP_SUBSTRING_ANY) {
                     buffer.append('%');
                 }
-                buffer.append(value);
+                buffer.append(value.replaceAll("'", "''"));
                 // endsWith not supported by exchange, always append %
                 buffer.append('%');
                 buffer.append('\'');