CMake: Make sure processes are dead before cleaning temporary directory

This should stop messages about processes still running when cleaning
up the directory on windows.

This also makes sure the progress bars are closed again.

Change-Id: Ic3e94efc8bdecca35437987e0647284cb48af121
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/cmakeprojectmanager/builddirmanager.cpp

@@ -110,6 +110,7 @@ BuildDirManager::BuildDirManager(const CMakeBuildConfiguration *bc) :
 
 BuildDirManager::~BuildDirManager()
 {
+    stopProcess();
     resetData();
     delete m_tempDir;
 }