Qt4ProjectManager: Remove redundant friend declaration.

Change-Id: I50cc1f3281167d2435dafbcd9ea4076ca88caa74
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/qt4projectmanager/qt4buildconfiguration.h

@@ -50,7 +50,6 @@ namespace Internal { class Qt4ProjectConfigWidget; }
 class QT4PROJECTMANAGER_EXPORT Qt4BuildConfiguration : public ProjectExplorer::BuildConfiguration
 {
     Q_OBJECT
-    friend class Qt4BuildConfigurationFactory;
 
 public:
     explicit Qt4BuildConfiguration(ProjectExplorer::Target *target);