Utils: Fix MinGW build

Amends a0f6e8dc04

The issue is that pthread.h is including <process.h>, which ends up to
utils/process.h since it's first in path.

Change-Id: I525384083b6952aded4b77c29d00d85f084c60f9
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/libs/utils/process.h

@@ -1,7 +1,11 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#pragma once
+#if defined(Q_CC_MINGW) && defined(WIN_PTHREADS_H) && !defined(_INC_PROCESS)
+  // Arrived here via <pthread.h> which wants to include <process.h>
+  #include_next <process.h>
+#elif !defined(UTILS_PROCESS_H)
+#define UTILS_PROCESS_H
 
 #include "utils_global.h"
 
@@ -217,3 +221,5 @@ public:
 } // namespace Utils
 
 QTC_DECLARE_CUSTOM_TASK(ProcessTask, Utils::ProcessTaskAdapter);
+
+#endif // UTILS_PROCESS_H

src/plugins/clangformat/CMakeLists.txt

@@ -39,4 +39,5 @@ extend_qtc_plugin(ClangFormat
     tests/clangformat-test.h
   DEFINES
     TESTDATA_DIR="${CMAKE_CURRENT_SOURCE_DIR}/tests/data"
+  EXPLICIT_MOC tests/clangformat-test.h
 )

src/plugins/vcpkg/CMakeLists.txt

@@ -13,4 +13,5 @@ extend_qtc_plugin(Vcpkg
   CONDITION WITH_TESTS
   SOURCES
     vcpkg_test.cpp vcpkg_test.h
+  EXPLICIT_MOC vcpkg_test.h
 )