build: Clear cache before requiring build specs
build: Clear cache before requiring build specs

Change-Id: Iac701297280fa3395499d403a9038fd8aa85fb4e

carmoIn/atom-build,bwinton/atom-build,gogoprog/atom-build,sphaerophoria/atom-build,noseglid/atom-build,gregerolsson/atom-build,MackieLoeffel/atom-build,forivall/atom-build,jhasse/atom-build,tomoasleep/atom-build,MadcapJake/atom-build,5n8ke/atom-build,e-jigsaw/atom-build,oli-obk/atom-build