remove remainders of mysqlc extension files

Change-Id: I0eaaeef001c70450319e0b3d8774a76ffa163945
Reviewed-on: https://gerrit.libreoffice.org/61122
Tested-by: Jenkins
Reviewed-by: Andras Timar <andras.timar@collabora.com>

connectivity/source/drivers/mysqlc/META-INF/manifest.xml

-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE manifest:manifest PUBLIC "-//OpenOffice.org//DTD Manifest 1.0//EN" "Manifest.dtd">
-<!--
- * This file is part of the LibreOffice project.
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * This file incorporates work covered by the following license notice:
- *
- *   Licensed to the Apache Software Foundation (ASF) under one or more
- *   contributor license agreements. See the NOTICE file distributed
- *   with this work for additional information regarding copyright
- *   ownership. The ASF licenses this file to you under the Apache
- *   License, Version 2.0 (the "License"); you may not use this file
- *   except in compliance with the License. You may obtain a copy of
- *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
- -->
-<manifest:manifest xmlns:manifest="http://openoffice.org/2001/manifest">
-    <manifest:file-entry manifest:media-type="application/vnd.sun.star.uno-components;platform=@PLATFORM@"
-        manifest:full-path="components.rdb"/>
-    <manifest:file-entry manifest:media-type="application/vnd.sun.star.configuration-data"
-                 manifest:full-path="registry/data/org/openoffice/Office/DataAccess/Drivers.xcu"/>
-</manifest:manifest>

connectivity/source/drivers/mysqlc/description-en-US.txt

-MySQL Connector installs a native MySQL database driver. It is faster, seamless integrated, easier to administrate and there is no need to install and setup a JDBC or ODBC driver separately. It was never easier to use MySQL databases in LibreOffice Base.

connectivity/source/drivers/mysqlc/description.xml

-<?xml version="1.0" encoding="UTF-8"?>
-<!--
- * This file is part of the LibreOffice project.
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * This file incorporates work covered by the following license notice:
- *
- *   Licensed to the Apache Software Foundation (ASF) under one or more
- *   contributor license agreements. See the NOTICE file distributed
- *   with this work for additional information regarding copyright
- *   ownership. The ASF licenses this file to you under the Apache
- *   License, Version 2.0 (the "License"); you may not use this file
- *   except in compliance with the License. You may obtain a copy of
- *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
- -->
-<description xmlns="http://openoffice.org/extensions/description/2006" xmlns:d="http://openoffice.org/extensions/description/2006"
-    xmlns:xlink="http://www.w3.org/1999/xlink">
-
-    <identifier value="com.sun.star.mysql-connector-ooo-@PLATFORM@"/>
-    <version value="1.0.2" />
-    <platform value="@PLATFORM@" />
-    <display-name>
-        <name lang="en-US">MySQL Connector</name>
-    </display-name>
-    <dependencies>
-         <OpenOffice.org-minimal-version value="3.3" d:name="OpenOffice.org 3.3"/>
-    </dependencies>
-    <publisher>
-        <name xlink:href="http://www.documentfoundation.org" lang="en-US">The Document Foundation</name>
-    </publisher>
-    <icon>
-        <default xlink:href="images/extension_32.png" />
-    </icon>
-    <extension-description>
-        <src lang="en-US" xlink:href="description-en-US.txt"/>
-    </extension-description>
-</description>