Remove BuildConfigWidget::init()

It no longer serves a purpose.

Change-Id: Icdcb69c87112e295cefd4975dfa2b3d65818365a
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/genericprojectmanager/genericbuildconfiguration.h

@@ -94,12 +94,10 @@ class GenericBuildSettingsWidget : public ProjectExplorer::BuildConfigWidget
     Q_OBJECT
 
 public:
-    GenericBuildSettingsWidget();
+    GenericBuildSettingsWidget(GenericBuildConfiguration *bc);
 
     QString displayName() const;
 
-    void init(ProjectExplorer::BuildConfiguration *bc);
-
 private slots:
     void buildDirectoryChanged();