PE: Remove unused connections

Change-Id: Ia4173ed44e4b0cc56031fc0b280103fc869609c7
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/projectexplorer/extracompiler.cpp

@@ -41,13 +41,9 @@ public:
     FileNameToContentsHash contents;
     QDateTime compileTime;
     IEditor *lastEditor = nullptr;
-    QMetaObject::Connection activeBuildConfigConnection;
-    QMetaObject::Connection activeEnvironmentConnection;
     Guard lock;
     bool dirty = false;
-
     QTimer timer;
-
     TaskTreeRunner m_taskTreeRunner;
 };