The simplest way for you to build your binary would be to run a VM of your target OS and arch on your online machine, build the binary from that, then take it to your offline signer.
armory_0.96.2-ubuntu14.04-i386_offline.tar.gz might be worth trying too..? Though with caveats. Hoping they'll have any other dependencies already, for one, and not using segwit being another.
You'll have to stick to 0.96.2 on the online machine as well then.