Updated build script to check for 7zip
Updated build script to check for 7zip

markwal/OctoPrint,AstroPrint/AstroBox,bicephale/OctoPrint,skieast/OctoPrint,markwal/OctoPrint,abinashk-inf/AstroBox,abinashk-inf/AstroBox,punkkeks/OctoPrint,bicephale/OctoPrint,nicanor-romero/OctoPrint,CapnBry/OctoPrint,masterhou/OctoPrint,ymilord/OctoPrint-MrBeam,C-o-r-E/OctoPrint,SeveQ/OctoPrint,Salandora/OctoPrint,eliasbakken/OctoPrint,madhuni/AstroBox,Catrodigious/OctoPrint-TAM,MoonshineSG/OctoPrint,shaggythesheep/OctoPrint,ymilord/OctoPrint-MrBeam,senttech/OctoPrint,Voxel8/OctoPrint,Skeen/OctoPrint,ymilord/OctoPrint-MrBeam,alephobjects/Cura,CapnBry/OctoPrint,Salandora/OctoPrint,AstroPrint/AstroBox,foosel/OctoPrint,beeverycreative/BEEweb,eddieparker/OctoPrint,EZ3-India/EZ-Remote,Javierma/OctoPrint-TFG,ErikDeBruijn/OctoPrint,Javierma/OctoPrint-TFG,madhuni/AstroBox,shohei/Octoprint,ryanneufeld/OctoPrint,leductan-nguyen/RaionPi,EZ3-India/EZ-Remote,CapnBry/OctoPrint,ErikDeBruijn/OctoPrint,jneves/OctoPrint,abinashk-inf/AstroBox,DanLipsitt/OctoPrint,leductan-nguyen/RaionPi,Salandora/OctoPrint,dansantee/OctoPrint,rurkowce/octoprint-fork,Jaesin/OctoPrint,MoonshineSG/OctoPrint,MolarAmbiguity/OctoPrint,nickverschoor/OctoPrint,Salandora/OctoPrint,eddieparker/OctoPrint,mayoff/OctoPrint,3dprintcanalhouse/octoprint2,skieast/OctoPrint,SeveQ/OctoPrint,mcanes/OctoPrint,beeverycreative/BEEweb,Skeen/OctoPrint,Catrodigious/OctoPrint-TAM,foosel/OctoPrint,eliasbakken/OctoPrint,ymilord/OctoPrint-MrBeam,alex1818/OctoPrint,uuv/OctoPrint,nicanor-romero/OctoPrint,senttech/OctoPrint,Voxel8/OctoPrint,spapadim/OctoPrint,shaggythesheep/OctoPrint,sstocker46/OctoPrint,Javierma/OctoPrint-TFG,Jaesin/OctoPrint,punkkeks/OctoPrint,MaxOLydian/OctoPrint,MoonshineSG/OctoPrint,spapadim/OctoPrint,Mikk36/OctoPrint,C-o-r-E/OctoPrint,markwal/OctoPrint,leductan-nguyen/RaionPi,spapadim/OctoPrint,mrbeam/OctoPrint,shohei/Octoprint,jneves/OctoPrint,d42/octoprint-fork,nickverschoor/OctoPrint,shaggythesheep/OctoPrint,chriskoz/OctoPrint,javivi001/OctoPrint,chriskoz/OctoPrint,jneves/OctoPrint,abinashk-inf/AstroBox,nickverschoor/OctoPrint,leductan-nguyen/RaionPi,Voxel8/OctoPrint,mcanes/OctoPrint,JackGavin13/octoprint-test-not-finished,hudbrog/OctoPrint,foosel/OctoPrint,madhuni/AstroBox,Javierma/OctoPrint-TFG,javivi001/OctoPrint,uuv/OctoPrint,ryanneufeld/OctoPrint,mcanes/OctoPrint,bicephale/OctoPrint,chriskoz/OctoPrint,ErikDeBruijn/OctoPrint,Mikk36/OctoPrint,EZ3-India/EZ-Remote,MoonshineSG/OctoPrint,uuv/OctoPrint,alex1818/OctoPrint,ymilord/OctoPrint-MrBeam,beeverycreative/BEEweb,shohei/Octoprint,CapnBry/OctoPrint,ryanneufeld/OctoPrint,alex1818/OctoPrint,Mikk36/OctoPrint,SeveQ/OctoPrint,nickverschoor/OctoPrint,Skeen/OctoPrint,bicephale/OctoPrint,senttech/OctoPrint,Jaesin/OctoPrint,dragondgold/OctoPrint,MaxOLydian/OctoPrint,chriskoz/OctoPrint,3dprintcanalhouse/octoprint2,shohei/Octoprint,mayoff/OctoPrint,foosel/OctoPrint,C-o-r-E/OctoPrint,mrbeam/OctoPrint,DanLipsitt/OctoPrint,madhuni/AstroBox,punkkeks/OctoPrint,aerickson/OctoPrint,rurkowce/octoprint-fork,MolarAmbiguity/OctoPrint,JackGavin13/octoprint-test-not-finished,aerickson/OctoPrint,masterhou/OctoPrint,hudbrog/OctoPrint,skieast/OctoPrint,dansantee/OctoPrint,masterhou/OctoPrint,dragondgold/OctoPrint,beeverycreative/BEEweb,aerickson/OctoPrint,EZ3-India/EZ-Remote,ryanneufeld/OctoPrint,eliasbakken/OctoPrint,MaxOLydian/OctoPrint,3dprintcanalhouse/octoprint1,eddieparker/OctoPrint,3dprintcanalhouse/octoprint1,nicanor-romero/OctoPrint,Catrodigious/OctoPrint-TAM,shohei/Octoprint,Jaesin/OctoPrint,alephobjects/Cura,JackGavin13/octoprint-test-not-finished,sstocker46/OctoPrint,mayoff/OctoPrint,JackGavin13/octoprint-test-not-finished,alephobjects/Cura,sstocker46/OctoPrint,hudbrog/OctoPrint,dragondgold/OctoPrint,javivi001/OctoPrint,dansantee/OctoPrint,AstroPrint/AstroBox,d42/octoprint-fork,senttech/OctoPrint,MolarAmbiguity/OctoPrint,mrbeam/OctoPrint