deps: don't check result of apt-get update #154
On Debian-based distributions, people sometimes have bad sources in apt, e.g. PPAs that no longer exist, or mirrors that no longer work, etc.. In these cases, `apt-get update` will still likely fetch the main distribution package lists, which is what we need, but return a non-zero exit code. Change `./installdeps` to not abort on non-zero exit status from `apt-get -qq update`.