Change the build directory for cmake

It is now in the parent directory of the src directory.
Task-Nr:   QTCREATORBUG-1109

src/plugins/cmakeprojectmanager/cmakeopenprojectwizard.cpp

@@ -77,7 +77,9 @@ CMakeOpenProjectWizard::CMakeOpenProjectWizard(CMakeManager *cmakeManager, const
         m_buildDirectory = m_sourceDirectory;
     } else {
         startid = ShadowBuildPageId;
-        m_buildDirectory = m_sourceDirectory + "/qtcreator-build";
+        QDir dir(m_sourceDirectory);
+        dir.cdUp();
+        m_buildDirectory = dir.absolutePath() + "/qtcreator-build";
     }
 
     setPage(InSourcePageId, new InSourceBuildPage(this));