Disable enabling Doxygen documentation build target in CMake build by default so that not having Doxygen installed does not cause configure failure in the common case that the user uses the defaults.
Disable enabling Doxygen documentation build target in CMake build
by default so that not having Doxygen installed does not cause configure
failure in the common case that the user uses the defaults.

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