Do not build Mono when not running on Unix
Do not build Mono when not running on Unix

This will later be changed

thomkinson/NLog,MartinTherriault/NLog,thomkinson/NLog,UgurAldanmaz/NLog,rajk987/NLog,ie-zero/NLog,ilya-g/NLog,tohosnet/NLog,304NotModified/NLog,bhaeussermann/NLog,fringebits/NLog,tmusico/NLog,nazim9214/NLog,luigiberrettini/NLog,vbfox/NLog,vladikk/NLog,fringebits/NLog,tetrodoxin/NLog,tmusico/NLog,czema/NLog,littlesmilelove/NLog,BrutalCode/NLog,littlesmilelove/NLog,vladikk/NLog,kevindaub/NLog,BrandonLegault/NLog,AndreGleichner/NLog,thomkinson/NLog,zbrad/NLog,pwelter34/NLog,ilya-g/NLog,czema/NLog,Niklas-Peter/NLog,hubo0831/NLog,AqlaSolutions/NLog-Unity3D,MoaidHathot/NLog,thomkinson/NLog,bhaeussermann/NLog,RRUZ/NLog,campbeb/NLog,babymechanic/NLog,luigiberrettini/NLog,vladikk/NLog,czema/NLog,RRUZ/NLog,michaeljbaird/NLog,AqlaSolutions/NLog-Unity3D,babymechanic/NLog,bryjamus/NLog,sean-gilliam/NLog,MartinTherriault/NLog,mikkelxn/NLog,Niklas-Peter/NLog,FeodorFitsner/NLog,breyed/NLog,ArsenShnurkov/NLog,fringebits/NLog,BrandonLegault/NLog,czema/NLog,michaeljbaird/NLog,rajk987/NLog,mikkelxn/NLog,rajk987/NLog,RichiCoder1/NLog,rajk987/NLog,matteobruni/NLog,ArsenShnurkov/NLog,vbfox/NLog,mikkelxn/NLog,AqlaSolutions/NLog-Unity3D,pwelter34/NLog,hubo0831/NLog,FeodorFitsner/NLog,ajayanandgit/NLog,nazim9214/NLog,rajeshgande/NLog,ajayanandgit/NLog,snakefoot/NLog,vladikk/NLog,bjornbouetsmith/NLog,campbeb/NLog,fringebits/NLog,ie-zero/NLog,MoaidHathot/NLog,matteobruni/NLog,mikkelxn/NLog,UgurAldanmaz/NLog,kevindaub/NLog,AndreGleichner/NLog,rajeshgande/NLog,BrandonLegault/NLog,zbrad/NLog,BrutalCode/NLog,tohosnet/NLog,BrandonLegault/NLog,tetrodoxin/NLog,RichiCoder1/NLog,breyed/NLog,bryjamus/NLog,NLog/NLog,AqlaSolutions/NLog-Unity3D,bjornbouetsmith/NLog