BUG: Fix for np.dtype(ctypes.Structure) does not respect _pack_ field
BUG: Fix for np.dtype(ctypes.Structure) does not respect _pack_ field

See #10532

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