Move make_install_req definition to top of function
Move make_install_req definition to top of function

Why: Makes the diff for the next commit cleaner

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