Manage InstallRequirement._temp_build_dir itself instead of its path
Manage InstallRequirement._temp_build_dir itself instead of its path

xavfernandez/pip,pfmoore/pip,pradyunsg/pip,pypa/pip,pfmoore/pip,sbidoul/pip,pradyunsg/pip,xavfernandez/pip,rouge8/pip,rouge8/pip,xavfernandez/pip,rouge8/pip,pypa/pip,sbidoul/pip