Made test_apps compile on os x with system c++
Made test_apps compile on os x with system c++

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