BLD: check for CBLAS header in "unoptimized" blas
BLD: check for CBLAS header in "unoptimized" blas

Allows building against system installed blas library that might be
optimized.

sonnyhu/numpy,Eric89GXL/numpy,chiffa/numpy,anntzer/numpy,mattip/numpy,pdebuyl/numpy,Yusa95/numpy,skymanaditya1/numpy,b-carter/numpy,skwbc/numpy,ahaldane/numpy,ViralLeadership/numpy,ViralLeadership/numpy,ssanderson/numpy,dato-code/numpy,pizzathief/numpy,ChanderG/numpy,empeeu/numpy,rhythmsosad/numpy,yiakwy/numpy,empeeu/numpy,brandon-rhodes/numpy,ContinuumIO/numpy,sigma-random/numpy,pyparallel/numpy,GrimDerp/numpy,sigma-random/numpy,MaPePeR/numpy,pbrod/numpy,gfyoung/numpy,anntzer/numpy,musically-ut/numpy,charris/numpy,KaelChen/numpy,SunghanKim/numpy,shoyer/numpy,anntzer/numpy,shoyer/numpy,mathdd/numpy,hainm/numpy,grlee77/numpy,jonathanunderwood/numpy,naritta/numpy,madphysicist/numpy,Linkid/numpy,dch312/numpy,pdebuyl/numpy,yiakwy/numpy,WillieMaddox/numpy,pizzathief/numpy,maniteja123/numpy,MichaelAquilina/numpy,njase/numpy,Yusa95/numpy,dimasad/numpy,leifdenby/numpy,larsmans/numpy,bringingheavendown/numpy,maniteja123/numpy,simongibbons/numpy,moreati/numpy,joferkington/numpy,njase/numpy,mhvk/numpy,bertrand-l/numpy,seberg/numpy,musically-ut/numpy,ekalosak/numpy,Srisai85/numpy,cowlicks/numpy,jorisvandenbossche/numpy,dch312/numpy,chiffa/numpy,larsmans/numpy,cjermain/numpy,trankmichael/numpy,gfyoung/numpy,jakirkham/numpy,rgommers/numpy,Eric89GXL/numpy,CMartelLML/numpy,CMartelLML/numpy,GaZ3ll3/numpy,ChanderG/numpy,nguyentu1602/numpy,BMJHayward/numpy,Linkid/numpy,mathdd/numpy,anntzer/numpy,rherault-insa/numpy,Yusa95/numpy,pizzathief/numpy,grlee77/numpy,grlee77/numpy,gmcastil/numpy,pdebuyl/numpy,sonnyhu/numpy,mortada/numpy,githubmlai/numpy,seberg/numpy,solarjoe/numpy,mwiebe/numpy,tdsmith/numpy,cjermain/numpy,SunghanKim/numpy,felipebetancur/numpy,CMartelLML/numpy,rherault-insa/numpy,SiccarPoint/numpy,ChristopherHogan/numpy,larsmans/numpy,drasmuss/numpy,rajathkumarmp/numpy,sonnyhu/numpy,larsmans/numpy,naritta/numpy,MaPePeR/numpy,rhythmsosad/numpy,ekalosak/numpy,musically-ut/numpy,mingwpy/numpy,kirillzhuravlev/numpy,ESSS/numpy,has2k1/numpy,felipebetancur/numpy,shoyer/numpy,pbrod/numpy,sigma-random/numpy,mattip/numpy,tynn/numpy,njase/numpy,rmcgibbo/numpy,yiakwy/numpy,groutr/numpy,MaPePeR/numpy,madphysicist/numpy,Anwesh43/numpy,madphysicist/numpy,WillieMaddox/numpy,Linkid/numpy,dato-code/numpy,bmorris3/numpy,endolith/numpy,maniteja123/numpy,joferkington/numpy,MSeifert04/numpy,GaZ3ll3/numpy,BMJHayward/numpy,numpy/numpy,rgommers/numpy,rajathkumarmp/numpy,chatcannon/numpy,Eric89GXL/numpy,cowlicks/numpy,WarrenWeckesser/numpy,nbeaver/numpy,mattip/numpy,behzadnouri/numpy,simongibbons/numpy,mhvk/numpy,Eric89GXL/numpy,GaZ3ll3/numpy,mingwpy/numpy,tdsmith/numpy,mortada/numpy,charris/numpy,Srisai85/numpy,Srisai85/numpy,SiccarPoint/numpy,utke1/numpy,GaZ3ll3/numpy,kirillzhuravlev/numpy,githubmlai/numpy,kirillzhuravlev/numpy,pdebuyl/numpy,sonnyhu/numpy,nbeaver/numpy,jankoslavic/numpy,SunghanKim/numpy,rgommers/numpy,Dapid/numpy,tdsmith/numpy,SiccarPoint/numpy,naritta/numpy,b-carter/numpy,Anwesh43/numpy,sinhrks/numpy,dwillmer/numpy,mindw/numpy,dwillmer/numpy,ContinuumIO/numpy,mortada/numpy,charris/numpy,stuarteberg/numpy,seberg/numpy,dato-code/numpy,dwillmer/numpy,musically-ut/numpy,ajdawson/numpy,Dapid/numpy,jankoslavic/numpy,ChanderG/numpy,behzadnouri/numpy,cjermain/numpy,hainm/numpy,mindw/numpy,moreati/numpy,ekalosak/numpy,empeeu/numpy,mingwpy/numpy,solarjoe/numpy,rudimeier/numpy,nguyentu1602/numpy,jankoslavic/numpy,Srisai85/numpy,simongibbons/numpy,brandon-rhodes/numpy,nbeaver/numpy,MSeifert04/numpy,BabeNovelty/numpy,nguyentu1602/numpy,pyparallel/numpy,groutr/numpy,mhvk/numpy,cowlicks/numpy,tacaswell/numpy,madphysicist/numpy,chatcannon/numpy,groutr/numpy,joferkington/numpy,KaelChen/numpy,stuarteberg/numpy,mattip/numpy,rmcgibbo/numpy,bringingheavendown/numpy,ahaldane/numpy,jorisvandenbossche/numpy,githubmlai/numpy,BabeNovelty/numpy,cowlicks/numpy,hainm/numpy,jakirkham/numpy,ahaldane/numpy,joferkington/numpy,mingwpy/numpy,SunghanKim/numpy,naritta/numpy,shoyer/numpy,drasmuss/numpy,skwbc/numpy,b-carter/numpy,drasmuss/numpy,KaelChen/numpy,seberg/numpy,has2k1/numpy,ChristopherHogan/numpy,rmcgibbo/numpy,MichaelAquilina/numpy,stuarteberg/numpy,tynn/numpy,bertrand-l/numpy,tacaswell/numpy,numpy/numpy,ChanderG/numpy,chiffa/numpy,mindw/numpy,kiwifb/numpy,stuarteberg/numpy,bertrand-l/numpy,MichaelAquilina/numpy,jschueller/numpy,AustereCuriosity/numpy,ChristopherHogan/numpy,Dapid/numpy,moreati/numpy,skymanaditya1/numpy,mortada/numpy,abalkin/numpy,tynn/numpy,BabeNovelty/numpy,rhythmsosad/numpy,MSeifert04/numpy,mhvk/numpy,gmcastil/numpy,brandon-rhodes/numpy,WarrenWeckesser/numpy,felipebetancur/numpy,skwbc/numpy,argriffing/numpy,kiwifb/numpy,AustereCuriosity/numpy,grlee77/numpy,jakirkham/numpy,has2k1/numpy,ChristopherHogan/numpy,AustereCuriosity/numpy,Yusa95/numpy,BMJHayward/numpy,pyparallel/numpy,nguyentu1602/numpy,ssanderson/numpy,rajathkumarmp/numpy,mwiebe/numpy,sinhrks/numpy,solarjoe/numpy,rajathkumarmp/numpy,rherault-insa/numpy,pbrod/numpy,simongibbons/numpy,CMartelLML/numpy,jschueller/numpy,brandon-rhodes/numpy,pizzathief/numpy,jonathanunderwood/numpy,SiccarPoint/numpy,ViralLeadership/numpy,charris/numpy,GrimDerp/numpy,dato-code/numpy,skymanaditya1/numpy,felipebetancur/numpy,trankmichael/numpy,simongibbons/numpy,has2k1/numpy,hainm/numpy,trankmichael/numpy,BabeNovelty/numpy,behzadnouri/numpy,pbrod/numpy,cjermain/numpy,bringingheavendown/numpy,ESSS/numpy,GrimDerp/numpy,jorisvandenbossche/numpy,ssanderson/numpy,argriffing/numpy,shoyer/numpy,utke1/numpy,ddasilva/numpy,bmorris3/numpy,ekalosak/numpy,ajdawson/numpy,bmorris3/numpy,tdsmith/numpy,mhvk/numpy,WarrenWeckesser/numpy,numpy/numpy,dch312/numpy,dimasad/numpy,utke1/numpy,jakirkham/numpy,Anwesh43/numpy,bmorris3/numpy,Anwesh43/numpy,abalkin/numpy,BMJHayward/numpy,dimasad/numpy,leifdenby/numpy,jankoslavic/numpy,dch312/numpy,ddasilva/numpy,grlee77/numpy,mathdd/numpy,ESSS/numpy,ContinuumIO/numpy,sinhrks/numpy,jorisvandenbossche/numpy,ddasilva/numpy,argriffing/numpy,tacaswell/numpy,dimasad/numpy,madphysicist/numpy,rudimeier/numpy,dwillmer/numpy,empeeu/numpy,WarrenWeckesser/numpy,sigma-random/numpy,sinhrks/numpy,mathdd/numpy,trankmichael/numpy,jonathanunderwood/numpy,ajdawson/numpy,pizzathief/numpy,WillieMaddox/numpy,MaPePeR/numpy,ajdawson/numpy,mindw/numpy,abalkin/numpy,kirillzhuravlev/numpy,pbrod/numpy,mwiebe/numpy,jorisvandenbossche/numpy,ahaldane/numpy,GrimDerp/numpy,WarrenWeckesser/numpy,kiwifb/numpy,leifdenby/numpy,githubmlai/numpy,jakirkham/numpy,rudimeier/numpy,yiakwy/numpy,chatcannon/numpy,skymanaditya1/numpy,rudimeier/numpy,gmcastil/numpy,MSeifert04/numpy,KaelChen/numpy,jschueller/numpy,endolith/numpy,MSeifert04/numpy,ahaldane/numpy,MichaelAquilina/numpy,endolith/numpy,endolith/numpy,numpy/numpy,rmcgibbo/numpy,jschueller/numpy,rhythmsosad/numpy,gfyoung/numpy,rgommers/numpy,Linkid/numpy