Make sure /usr/bin/go from gccgo exists
Make sure /usr/bin/go from gccgo exists

Fix dapper image build, which broke at some point: apparently because of gccgo packaging change

rancher/os,SvenDowideit/os,juliengk/os,rancherio/os,SvenDowideit/os,imikushin/os,juliengk/os,rancherio/os,rancherio/os,gizmotronic/os,rancher/os,ibuildthecloud/os,ibuildthecloud/os,gizmotronic/os,imikushin/os