Allow relative paths in Build directories, Working Directories

Relative to the project's directory.

src/plugins/genericprojectmanager/genericproject.cpp

@@ -478,6 +478,7 @@ GenericBuildSettingsWidget::GenericBuildSettingsWidget(GenericProject *project)
     // build directory
     m_pathChooser = new Utils::PathChooser(this);
     m_pathChooser->setEnabled(true);
+    m_pathChooser->setBaseDirectory(project->projectDirectory());
     fl->addRow(tr("Build directory:"), m_pathChooser);
     connect(m_pathChooser, SIGNAL(changed(QString)), this, SLOT(buildDirectoryChanged()));