MAINT: Avoid extra copies in linalg.lstsq
MAINT: Avoid extra copies in linalg.lstsq

This takes gh-5909 a little further.

abalkin/numpy,WarrenWeckesser/numpy,ahaldane/numpy,ahaldane/numpy,grlee77/numpy,mattip/numpy,anntzer/numpy,mhvk/numpy,shoyer/numpy,mattip/numpy,mhvk/numpy,MSeifert04/numpy,jakirkham/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,pdebuyl/numpy,ahaldane/numpy,pbrod/numpy,grlee77/numpy,gfyoung/numpy,shoyer/numpy,abalkin/numpy,anntzer/numpy,mattip/numpy,endolith/numpy,tynn/numpy,Eric89GXL/numpy,pizzathief/numpy,anntzer/numpy,pizzathief/numpy,seberg/numpy,Eric89GXL/numpy,simongibbons/numpy,tynn/numpy,pizzathief/numpy,pdebuyl/numpy,madphysicist/numpy,numpy/numpy,tynn/numpy,numpy/numpy,mattip/numpy,mhvk/numpy,madphysicist/numpy,shoyer/numpy,charris/numpy,WarrenWeckesser/numpy,MSeifert04/numpy,seberg/numpy,jorisvandenbossche/numpy,madphysicist/numpy,MSeifert04/numpy,Eric89GXL/numpy,rgommers/numpy,endolith/numpy,Eric89GXL/numpy,WarrenWeckesser/numpy,shoyer/numpy,charris/numpy,simongibbons/numpy,jakirkham/numpy,madphysicist/numpy,pizzathief/numpy,rgommers/numpy,jorisvandenbossche/numpy,charris/numpy,ahaldane/numpy,madphysicist/numpy,jakirkham/numpy,simongibbons/numpy,simongibbons/numpy,grlee77/numpy,pdebuyl/numpy,jorisvandenbossche/numpy,charris/numpy,gfyoung/numpy,anntzer/numpy,MSeifert04/numpy,seberg/numpy,mhvk/numpy,jakirkham/numpy,rgommers/numpy,pbrod/numpy,shoyer/numpy,grlee77/numpy,MSeifert04/numpy,pbrod/numpy,grlee77/numpy,numpy/numpy,WarrenWeckesser/numpy,gfyoung/numpy,pizzathief/numpy,endolith/numpy,ahaldane/numpy,jakirkham/numpy,pdebuyl/numpy,abalkin/numpy,mhvk/numpy,endolith/numpy,numpy/numpy,jorisvandenbossche/numpy,pbrod/numpy,simongibbons/numpy,rgommers/numpy,pbrod/numpy,seberg/numpy