Add x86_64 arch flag if gfortran supports it.
Add x86_64 arch flag if gfortran supports it.

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