Fix CMake for OSX
Fix CMake for OSX

Fix glitches that prevent the CMake build from working on OSX:
— Must explicitly set -target flag for clang for -m64 flag to work (as
is done in Makefile)
— Remove unnecessary -ltinfo directive (doesn’t exist on OSX)

dougkwan/Halide,delcypher/Halide,kenkuang1213/Halide,fengzhyuan/Halide,smxlong/Halide,kenkuang1213/Halide,smxlong/Halide,aam/Halide,psuriana/Halide,psuriana/Halide,dan-tull/Halide,aam/Halide,fengzhyuan/Halide,rodrigob/Halide,aam/Halide,kgnk/Halide,aam/Halide,kenkuang1213/Halide,dan-tull/Halide,jiawen/Halide,tdenniston/Halide,delcypher/Halide,damienfir/Halide,dougkwan/Halide,jiawen/Halide,damienfir/Halide,adasworks/Halide,tdenniston/Halide,psuriana/Halide,tdenniston/Halide,mcanthony/Halide,ayanazmat/Halide,psuriana/Halide,adasworks/Halide,ronen/Halide,gchauras/Halide,ronen/Halide,adasworks/Halide,kgnk/Halide,ronen/Halide,damienfir/Halide,smxlong/Halide,dougkwan/Halide,ronen/Halide,mcanthony/Halide,dougkwan/Halide,dan-tull/Halide,dougkwan/Halide,dan-tull/Halide,myrtleTree33/Halide,jiawen/Halide,tdenniston/Halide,fengzhyuan/Halide,fengzhyuan/Halide,lglucin/Halide,myrtleTree33/Halide,delcypher/Halide,rodrigob/Halide,dan-tull/Halide,ronen/Halide,kenkuang1213/Halide,aam/Halide,jiawen/Halide,psuriana/Halide,smxlong/Halide,gchauras/Halide,mcanthony/Halide,damienfir/Halide,mcanthony/Halide,delcypher/Halide,dougkwan/Halide,lglucin/Halide,smxlong/Halide,delcypher/Halide,damienfir/Halide,kgnk/Halide,myrtleTree33/Halide,fengzhyuan/Halide,rodrigob/Halide,fengzhyuan/Halide,smxlong/Halide,ronen/Halide,mcanthony/Halide,aam/Halide,myrtleTree33/Halide,rodrigob/Halide,ronen/Halide,lglucin/Halide,ayanazmat/Halide,dan-tull/Halide,ayanazmat/Halide,dan-tull/Halide,myrtleTree33/Halide,kenkuang1213/Halide,adasworks/Halide,dan-tull/Halide,delcypher/Halide,adasworks/Halide,lglucin/Halide,dougkwan/Halide,aam/Halide,gchauras/Halide,ayanazmat/Halide,kgnk/Halide,kgnk/Halide,kenkuang1213/Halide,myrtleTree33/Halide,delcypher/Halide,kgnk/Halide,kenkuang1213/Halide,lglucin/Halide,psuriana/Halide,psuriana/Halide,damienfir/Halide,smxlong/Halide,kgnk/Halide,jiawen/Halide,delcypher/Halide,ayanazmat/Halide,myrtleTree33/Halide,ayanazmat/Halide,rodrigob/Halide,damienfir/Halide,fengzhyuan/Halide,mcanthony/Halide,jiawen/Halide,mcanthony/Halide,ayanazmat/Halide,jiawen/Halide,lglucin/Halide,myrtleTree33/Halide,dougkwan/Halide,ronen/Halide,gchauras/Halide,rodrigob/Halide,rodrigob/Halide,rodrigob/Halide,adasworks/Halide,mcanthony/Halide,fengzhyuan/Halide,adasworks/Halide,gchauras/Halide,lglucin/Halide,gchauras/Halide,ayanazmat/Halide,damienfir/Halide,kenkuang1213/Halide,tdenniston/Halide,kgnk/Halide,tdenniston/Halide,adasworks/Halide,smxlong/Halide,tdenniston/Halide,tdenniston/Halide