Revert "Clang: Add possibility to "pgo-train" libclang with a batch file"

This reverts commit 07f4ae6227,
which broke compilation

clangbatchfileprocessor.cpp:170:27: error: ambiguous overload for
    'operator==' (operand types are 'const QChar' and 'char')

and only worked in QT_TEST=1 cases.

Change-Id: I089427359958221882cb4e4369c4b88d71779acf
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/clangcodemodel/clangbatchfileprocessor.h

@@ -1,36 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2017 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of Qt Creator.
-**
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3 as published by the Free Software
-** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-3.0.html.
-**
-****************************************************************************/
-
-#pragma once
-
-#include <QString>
-
-namespace ClangCodeModel {
-namespace Internal {
-
-bool runClangBatchFile(const QString &filePath);
-
-} // namespace Internal
-} // namespace ClangCodeModel